What size is your motor? How much hp do you predict it to make? A 1 5/8" primary longtube tuned length header is usually the best for most apps. Displacements over 400 C.I. with more than 450 hp, i would recommend a 1 3/4" header. Also, do your research to make sure you get the best fitting set of headers possible. You don't want to have to dimple a new set of headers for clearance. I just bought a set of doug's D368 headers for my car this week. I'll post some pictures when I go home this weekend. They are a little pricey but I've heard really good things about the fitment of these headers.
1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags
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