Honestly, if you are looking for headers I would just install a set of reproduction Long Branch manifolds instead. They were a factory option on them originally, they flow almost as good as a header, they don't leak and they fit with no modification besides an oil filter adapter. That is a somewhat big car but it could be a Bonneville. Im assuming that it has a 2bbl carb on it. The first thing to do to make power with it is go to a 4bbl intake and it wouldn't hurt to step up the cam a little. Intake, Cam duration, Exhaust, and rear end gear are the weak points that slow the car down. Once you fix those it will be a stout car. That is one awesome car if you ask me. Welcome to the world of Pontiac.
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