The biggest problem we have had with these types of engines and what I mean by that is the 351C/Yates style heads and intakes is that it will not fit under the hood of most Cobras. This is why the windsor head engine is so popular in these cars and the headers would be a pain in the ass. You can build some real nice 427 to 454C.I. small block engine with the CHI, Yates, Brodix BF 202, Blue Thunder heads and make all kinds of power but it is a hard fit in most Cobras and GT-40s. We run all of the above heads as well as the new Ford Racing SC1 and D3 heads on circle track cars with weights from 350 to 380 pounds. When the price comes into play and the extra cost of installation I can not get many people interested. If you ran a real low dry sump style
oil pan and a 9.200 block you might get it in there. This is where the 8.200 aluminum blocks come in to play and help with the over all height. We have a 8.200 deck aluminum engine with wedge heads that weighs about 312 lbs. You can use a Edelbrock Victor head and make this kind of power and have a better chance of getting under the hood and the headers would be easier. Just some things that I have ran into over the years. Thanks, Keith