Who put the camshaft in the engine? If the timing chain is one that has multiple advance and retard keyways, I would check to make sure they used the correct mark and associated keyway. I have had several Pontiac engines over the years come in my shop for troubleshooting with the same symptoms as yours. In each case it appeared that it was a good combination and should run well, but didn't have ANY power. When I inspected the timing chain installation, I have found that they incorrectly used the keyway on the crank gear to line up with the mark on the cam gear. Once corrected the cars ran like they were supposed to .
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs
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