OH you mean a Weber kit. word on the street is they don't perfomr as well at angles as a good Aisin carb, and the Aisin actually flows better. I have no direct knowledge/proof, but this is what I hear. PM 79coyotefrg....he runs a weber. Weber is owned by Holley now. They are damned expensive, and when iwas in the market for one, the weber plant in spain had been shut down for like 16mos. Don't know if they are back up or not. I know there were NO CA smog legal kits available then (don't know your location).
