Edelbrock Performer vs Edelbrock RPM Airgap

Heads are later model U heads, suppost to be 318-4bbl heads. They have 1.60 - 1.88 valves

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360 heads they are.

I'd degree the cam and mess with the distributor.

Between the two intakes you'll probably make more power with the air gap but be super hard pressed to feel the difference much less see it at the track.