I know for a fact that the Quad, does not like the lumpy lump camshafts, it was designed to save gas on a smooth idleing engine, so the primarys won't support the engine with enough gas.. because of all that nice extra lift, your motor now needs a larger gas supply to keep up with the demand.....

you could try reaming out the jets or replaceing them with bigger ones first, but you may need a 750 holley or something in the future