if its just going to be a street car,you can use the manifolds,but if your going for any type of performance i wouldnt use 3 tube headers they are hp killers,being i have been running a 80ga to now a 80 lemans and have gone from a 12sec 400 to a 9.90sec 505.i would try a set of headman headers for a 67 gto for the dports, if you bang the firewall alittle and i mean alittle on the drivers side and trim the rear lower control arms they will go in, i know, i,ve done it, in the jan 07 issue of hpp my car is in there with a 455 i borrowed and my old 4 tube headmans that i put back in for the dport motor
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