Call Roberts carburetor he knows what he is doing. I agree play with timing on a dyno and go from there first. And it depends who grinds your cam also each builder has their own design they feel will work. We just tested ours today 6" bore stock stroke and ground cam with mild porting in head and Johnson manifold and big nut. Didn't gain anything over a 72. Peaked at 43 horse ran 38 when we pulled it down. But the cam is ground to put out a higher and flatter torque curve.
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