ok so here goes. My dad has a 77 pontiac bonneville originally with a 403 now it has one of my old 350's in it . we have decided to add headers as i now have a spare set so i can just give my dad my old ones. My headers are full length headers for a 68-72 a body. I have not seen anyone who makes headers for the b body cars . someone on here has to be running headers on this chassis. Im just trying to find out if the headers will work etc etc.

 

Headers for an SBO sounds like an Olds-related question to me.

The problem with the B-body cars is the diagonal brace between the crossmember and the frame rails behind the lower control arms. Folks have removed these braces and used G-body headers, but I would not recommend that. GM isn't in the habit of installing parts that are unnecessary.