Thanks for the article link. I have the older Vortec heads. I just spent an hour in the garage putting shims between the manifolds and the heads and found that my ram's horn manifolds will barel fit between the frame rails of the Chevy. I will use the later model manifolds because they don't have the bulge on the lower end or I will get block hugger headers.

Thanks for the post. Incidentally, I had a '57 and paid $3393 for it new. It had every option Chevy offered and a 283.