question on edelbrock / afb carbs

carter used replacable venturi clusters to vary cfm as well as throttle bore sizing.

I think the early Carter 500 cfm carbs use a more restrictive venturi cluster to get the cfm desired. The only problem with just changing the venturi cluster will be the bleed sizes and emulsion if it has it.

There also is a guy on Ebay that offers parts to change your venturi and booster sizes.

If it were me i would find an old Carter 500 carb and use that.

Hysteric