finally got the rpm air gap and holley 750 h.p. on the duster.very pleased.carb was good out of the box.floats were set good,air/fuel idle was on it.may be a little fat on the jets,will test today as the weather is great.very happy with my choices.the only thing that sucked was the bypass hose.the magnum eddy is in a differant location,and i had to twist and trim the hose.