Ever considered putting the '54 body on the Granada frame? Old car/ New car?? Signed, the Devil's Advocate. HaHaHaHaHa (seriously, good luck with the swap) ( but think about it......)
If you didn't already have the 302 and C4, I'd advocate going with a 390 or other FE, from what I understand they fit even better than the 302 does, and you can even use the stock mounts (just put the right one on the left side and vice versa). I agree, get some steelies on that thing!