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I have two carbs. They were "reported" to be from 60's big block Corvettes. They are single fuel entry, double pump, with mechanical secondaries.
First one is LIST - 8711 (underneath is 3357)
Second one is LIST - 6210 (underneath is 0883)
Bob
Neither one was ever used on a Corvette (or any other Chevy); double-pumpers were never used on any production application (except '69 L-88). The 8711 was made in 1981, and the 6210 was made in 1973 (or83).