1974 Thermoquad, 360 HD Truck , Rebuild adding performance modifications

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This is a K&N Holley stub stack. It’s not a velocity stack, but I have seen them put into velocity stacks. The problem is one would cover the air bleeds into the primary boosters. Air bleeds are above the venturies in a Holley.
That is sick, cool
I flipped thru my notes I made a while backthat said air bleed enlargement, but didn't say how much based on what criteria or how to do it