Bought a 1972 standard bore cx scratch block with ribbed sides.  I know the block is not worth a lot.  Still had a c6 attached to it. Owner said came out of 67 f100 12 or 15 years ago.  It has c6-R heads. 1964 c5ae9425c intake, truck oil adapter. As I was tearing it down I notice it having a hatchet spacer on front. After taking oil pan off verified Lemans crank and rods.  Wondering if any value to anyone.  If so,  thinking of keeping bock and building 406.  Just going in my 66 truck.  Or these so old not in demand, also has scj balancer ?   THANKS

I think it may have been the era I grew up in, who's not to like 12 inch spring shackles, always heard got better gas mileage, going down hill all the time. just joking but I think its about right for me.  I installed GT spring in my mustang 15 yrs ago or about, I think it may set higher also.  Is there a way to preview photos before posting.  Thanks to all.

Photos of my new 2inch lift above stock purchased from spring company, did not take photo of original, but fender came to top of wheel.  Looks like about a 4inch lift from original springs.

I did check for preload, had a adjustable oem set on at first, tried a lot of preload to no preload, no difference in vacuum.  ended up shimming rocker stands about .008 since the block was milled the same amount and using non adjustable rockers with POP end stands.  The timing chain gear was cloyes brand with only one slot.  Tried to different vacuum gauges, read the same.  I am going to pull the front cover when weather warms, and if I don't see anything will give a shot degreeing the cam, will be a first for me.  I do have a summit degree wheel, but will have to be educated to use. THANKS!

I don't think I have a vacuum leak. Pvc and brake booster have been plugged, as well as a manifold and gaskets changed from PI to edel rpm, no change still 13in steady.  Checked with two different gauges.  did not degree cam, always just aligned the dots. If I am a tooth off would it still run ok?  Need to change balancer anyway the 67 PI balancer is wobbling.   Bought a professional products balancer a year ago to replace.  Looks like I need to pull front cover to check cam and if going that far am going to change cam.  Have a 274XE cam in my mustang 351w,  changed from 266 crane , made a different car.  Someone suggested for FE 274 XE, would the edelbrock valve springs handle that cam and do I need to change to adjustable valve train.  Have stock now with POP end stands.  THANKS!

Engine has around 1000 miles,3:50 rear , rpm intake, It runs good. but rough idle. no track time.  Any take off above idle will break the tires loose.  Just  am wondering if my combo would support a cam change and add to performance.   I am guessing around 3400#, aluminum waterpump heads and intake.