73LeMans is right, there isn't a company that makes ram air headers that will fit 73-77 a-bodies. I scoured tech lines and company products for months w/ no luck and i wasnt willing to try ram air headers for a 72 a-body or firebirds. Closet i found was Stainlessheaders.com that makes a build your own kit that I believe you can get in steel or stainless w/ up to. 2" primaries. I ended up going with Eddy Dport heads so I have never used that companies products & I can't verify the quality of their kit.
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1973 GTO, Len Williams 459CI shortblock, Eddy heads by John Gaydosh, ported Torker 1, SMI stage4 Qjet, TH400, GearVendor OD, 3.90 posi.
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