In this case I'll have to argue. I Built a 72 cutlass supreme 455, but it was a hardtop. The headers will not fit in stock incarnation, but it you bring them both in towards you motor about 1-1 1/2 inches and bend the head pipes to match they will clear without any heat issues. The clearance problems with the Supremes seems to lie more in the narrowing of the front frame. But it is doable. Just be sure to get stainless if you live in a rust prone area.