289-297 @ .020 is your advertised dur, thats a fairly large cam, 290B6 would outrun it with the other parts and setup you have now IMHO, Is it possible your ballancer shell has moved at all?, is the dist in right??, is it missing like a secondary ignition missfire or is it popping back through the intake?
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D.S.R.E. Your NW Pontiac Street/Strip Engine Builder, Specializing in Cylinder Head,Intake Manifold,and Exhaust Manifold Porting services and Building the Most Efficient stock rebuilds to Hi HP Pump Gas and Race Combinations for Pontiac,Buicks,Olds,FE Fords,385 Series and HP Gen 3 and 4 LS engines!
2006 silvy Z71 4X4,383 LS 600+hp NA
Shared Toy-66 Lemans 470cid by me 537hp 580tq-manifolds, 570hp 590tq-2"headers,custom cam,rpm intake, mild e-heads, Looks stock ;-}
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