Timing
Long shot but, does the timing chain have multible keyways so you can advance or retard the camshaft? I've had 2 or 3 cars in my shop over the years that had the timing chain installed wrong because of a mix-up on which timing marks to line up. It caused the camshaft to be retarded and caused poor idle and power.
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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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