Without actually smelling the exhaust, I sure can't tell you what your issue is, but remember a lean condition will cause similar issues. What I can tell you is that cam isn't your problem. As far as your mechanic... I think you have already received enough information to pass appropriate judgement on his Pontiac competance. I would continue to try and diagnose your issue with your current combination.
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Paul
FAST Automotive -The Pontiac restoration shop, not the fuel injection guys! I had the name first.
My site... needs updated-
www.fastrestorations.com
68 GTO's (RA II, RA I, HO, convert, Pro Street, Racecar, etc.), 2 69 GTO Judges, 70 GTO racecar -10.77 @ 124mph, 68 Tempest survivor, 3 03 Aztecs!
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