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dave story ported my chapman's mw stage 6 mopar heads , he claimed over 300 cfm on the intake ports . i build them for a 470 , but now building a 4.5 stroke rb 540 plus cubs . should i be looking into another pair of heads for this build ? as so using the new mopar mw intake with two 750 or bigger carbs or hillborn injection . a roller cam of custom grind . not trying to steal this tread just looking for info , so anyone can advise me on this new combo .