Check the accelerator pump arm adjuster settings,(both if it is a double pumper) hold the throttle at wide open and adjust the screw so you can barely get a .015 feeler gauge in between the pump arm and the adjuster bolt head In other words it(the pump arm and accelerator pump diaghramm) should have a of maximum .015 more travel at WOT

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)