I looked in to replace my Pontiac 455 with a 500" Cady. The 500" is real close to the same size as a big block Chevy. You can make BB Chev headers fit by cutting off the flange and welding Cadillac
header flanges on. There are some companys making good after market race parts for the big engines. I can't remember the name right now. I would think if a big block would fit the Nova's it should fit your truck. They are pretty wide though. Thats where I would start. Fender well to fender well. Front to back should be OK. Joe
