I do have a pair of custom Tom Vaught 660s with double hump arms on my 2-4 303 RA V Xram intake.The motor really did not like them on the dyno as too much too soon.We cant run any vac sec or double pumpers on the intake.Next time we are trying a set of 450 CFM man sec holleys.REALLY would like to get it driveable for my T/A.Tom
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