I hate Mustang II suspension for the very problems he shows. Rack site way up high. I saw one at the SEMA show, FE 63 Galaxie with a single stage external oil pump , pan was shallow at the front. I have also seen a dry sump on a pretty stock 302 with exhaust manifolds... all to give more spark plug room.
 So his solution is going to mean the whole tunnel and tranny crossmember needs to move rearward, the air clearer runs into the bracing at the back of the hood and protrudes out the front of the scoop unless the scoop is moved to the back edge. Power brake booster won't fit any more,  steering shaft may foul the oil filter too.

I thought i did but can only find one for Cyclone headers. If it's like them the only smallblock Ford headers are a fits-all for Maverick/Mustang/Falcon/Fairlane.70's Torino and a 79-up (63 catalog  Fox body and a Mustang II version Just the 3. There are several numbers for 351M trucks different 4x4 vs two wheel drive, different 79 and earlier than 80-up.
 I would imagine Blackjack had similar.

Very cool to get to see that engine in person.

One of the cars I saw there and thought was very well done is in this video. I also got to meet Nicole there. She does a good job of getting the whole story of this Buick. Sheesh just the license plate is more effort than many of the cars !

https://www.youtube.com/watch?v=7emTaHs-Ux8

There is a Whipple or similar screw blower with a carb flange on top. Someone has one on a street rod with BB Chevy around here. Carb sits at the back of the blower so in the way of the firewall for a pickup and would be too tall to fit most car hoods.

Edit: that would be a good use for an Offy 360 flat intake, those things look like a blower plenum.

That is a cool project.
If the block is even close to the 460 style you may be able to get one made or semi-finished by an existing supplier. Glen May had blocks cast for his Boss 429 ProMod using Cleveland main bearings, no water jackets and other non-production things. I think Carroll Carter but there are others.

Well that 68 "MY" Montego sure is special... a Cobra Jet, says 11 built. Where was the Spolier II from?

If some rich mook is crazy enough to overpay that much so be it,  but the truckle down effect will raise prices for the rest of us... now that distributor clamp is not just an FE but could be part of a hundred grand worth.