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Ken, Have you ever noticed the big "W" on the Edelbrock carbs? They are made for Edelbrock by Weber is my understanding, and yes they (one of the two) bought out Carter. Kinda strange...

Jerry you are correct they had the large & small holes used for the primary & secondaries most open up if they use a Edelbrock

You can always mill out your spread bore intake to accept a square bore carb, as the Edelbrock carb will accept the spreadbore bolt pattern, very simple operation for a machinist I have seen it done...