Had a pair of 3-tubes on my 70 GTO. It has a Turbo 400 and they fit fine. Probably just have to remove the usual stuff on the passenger side like the oil filter adapter and maybe the trans. lines. I believe the drivers side slid right in without removing anything. I think that I may have raised the motor slightly also. The car has a mild 455 and I ran low 12's with those headers.
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