387 with the 350 in the car it's a natural I add weight to J lighten to H. after looking @ the guide I think the 305 2bbl in that year looks like the best combo! it's a natural R add weight to T......T is a 14.70 index that 2bbl has an alum. intake on it......& I'm sure someone can build a carb for it. I think your looking @ a combo that can run low 14's without to many tricks....the hard part will be finding the intake.