Factory 427 block.  Was machined and run as a complete dyno tested engine for a period of time.  Eventually developed a fairly small coolant leak into the crankcase, looks like a porosity hole that opened up between a couple cylinders.  Should have been a straightforward drill & tap for a small pipe plug.  Someone local to the owner tried to repair it and thought they would have better access by removing the screwing freeze plugs that had been in place for 50+ years.  That did not work out well - used a torch to heat up the block/plug and cracked it pretty well.  Owner had another block, so we just swapped the internals and fixed him up.

I have sent pictures to HotRodFEGuy, who welds iron very successfully.  He estimated around $400ish for the repair.  The round trip shipping kinda hurts, so before I go that route I thought I'd advertise it "as is" first.  Bore is currently 4.265.  Pistons are custom flat tops from Racetec, for the common 4.250 stroke/6.7 combination.  Weld it/pin it/Hard Block it - your choice.

Price is obviously flexible, but we have to start somewhere.
Worst I can say is "no".
Won't fit in a mailbox - so shipping is "on you" - or pick it up.

I have these on ebay.  Will kill the listing and sell to any forum member...and cover the freight

https://www.ebay.com/itm/194272500212?mkevt=1&mkpid=0&emsid=e11050.m43.l1123&mkcid=7&ch=osgood&euid=2194157147ae4cd2a63971e8b5591037&bu=43167063057&osub=-1%7E1&crd=20210805185809&segname=11050&sojTags=ch%3Dch%2Cbu%3Dbu%2Cosub%3Dosub%2Ccrd%3Dcrd%2Csegname%3Dsegname%2Cchnl%3Dmkcid

Thanks guys!

Ran these on the recent EMC entry
Only have about 30 dyno pulls on them.
2WD pickup truck headers.
The black paint they ship with is pretty much burned off.
The weird little reduction to 2.5" step at the end of the collector has been removed (tried it - not good)
The gaskets are obviously gone
The bolt kit they send with them is in orbit somewhere - - why would a big company use a junk fastener with a 3/8-16 thread and a metric hex head?
Original price from the big box stores is about $287 - - can I get $200???

Now that the contest has ended I need to sell this engine - have to pay some bills.  Many of these parts were already in my shop from past projects.  With this years rules we decided to put them together as an assembly for the challenge.  As such, some of them are older but in good condition, while other items were borrowed and have to be returned - you thus have the option to purchase it as is - or customize this to suit your needs.

I will consider parting this out, but would prefer to sell the complete assembly.

This package consistently delivered over 530 horsepower both at home and at the EMC event.  One pull at home had a 538HP number, but it frequently hit 533 in both locations.  Best torque was around 520.  Power was around 526 at 5500 RPM and remained above that level beyond 6600 - - - really flat power band.  We usually ran it to 6800 for scoring, but did go beyond 7000 once just to see.

Specifics...
Block is a 390.  It is bore to 4.100 and has about two inches of hard block - - still quite a ways below the water pump holes and certainly still usable as a street piece.  Has a small (under a 1/2 inch) spot of weld on one deck next to the lifter valley.  We saw a suspicious looking area there and decided to stick a little bit of weld on as insurance.  There are perhaps three dozen pulls on the engine with no sign of any problems at all.

Crank is a 428 factory item ground 10-10
Rods are Scat H beams
Pistons are custom Race-tec flat tops with 10.47:1 compression, lateral gas ports and a 1.0-1.0-2.0mm Mahle ring pack
Balanced internally

Camshaft is a Bullet roller with just under .600 lift per specifications - measured .574 at the valve actual once assembled.
Damper is a Romac
Timing cover and chain are FE Power items
Oil pan is a Ford factory C8AX performance piece from 1968
Rockers are Harland Sharp bushing style with ARP mounting studs
Heads are C6AE-R castings, ported by Joe Craine.  Valves are Rev 2.150 and 1.650 with 11/32 stem.  Springs are Comp conical solid roller cam parts with titanium retainers.
Valve covers are really nice polished Blue Thunder competition style parts.

The Street Dominator intake that we ran belongs to Joe Craine and has already been removed for return to him.  The distributor we used belongs to Tim Young and has also been removed for return to him.  Same thing for the carburetor, which has already been given back to Randy Malik and Adney Brown.  If somebody wants to purchase this as a running engine we would install replacement parts of their choice and run it again on dyno before delivery.

Price will obviously depend on degree of completion and added parts desired, but when making offers or determining budget please realize that there are some fairly valuable and expensive parts included.  Despite the 390 block and iron heads, this is truly not an economy or budget type build.

I have the intake form the EMC engine for sale.
Edelbrock Victor EFI with the 4500 flange.
Excellent condition - been installed on engines but never in a car.
Has been ported by JDC - to Survival CNC heads (also fits CNC Edelbrock heads nicely)
Could doubtless be tweaked to fit many others as well
Has a couple pushrod tube inserts - no problems with them - just needed them for clearance

Intake new from the big box stores is $770+ for the 4150 flange version - they do not even show the 4500 flange

$1000.......

These were also in the recent Engine Masters Challenge entry.

They appear to be perfectly good - couple dozen dyno pulls to 6500ish with 150/500lb springs

New they are $435.99 at Summit - can be yours for $350.00 shipped - or offer...