Ok,then in your case,the carb flow isn't enough at part throttle,compared to whatever carb was one your engine before.
These Holley Webers are rated at 280 CFM according to Holley's own specs,that's two barrel cfm,rated different that 4 bbl.In 4 barrel terms,the HW flows about 200 cfm.Does the small primary on the HW flow less than your old carb?
