I have Doug's Header's on my 1976 Trans Am w/455. These headers were not recomended for T/A's later than 1974. I called Doug's and they would not guarantee that these headers would work on a 1976 model. Mine are the round port variety as I have E-Heads. It is a 4-speed car which meant that the steering column lockout linkage had to be removed. I'm not sure but maybe the 1974 and earlier don't have a lockout linkage. Anyway this seems to have been the issue as these headers fit perfectly with no other modifications and are of very high quality. Hope this helps.
David
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