O.K. first thing the headers are the same as 67-69 firebird headers. Supercomps should fit well because they are very expensive. I do not know what size headers you need because I have no idea of the power you motor is producing but I did have good luck with my $90 dynomax headers they fit perfect the first time. I would also recomend copper header and collector gaskets because my 400 was pretty good at blowing out the paper ones.
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