Stretching here but you said it was running a tad rough after all your changes. Got a couple plug wires crossed or one cylinder not getting fire? You’d be surprised how well a Pontiac will still run minus a cylinder….
That’s the problem with doing a few things at once…. chasing ghosts…. Gotta be something relatively simple.
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71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile
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