This is an original GM Rochester Carburator. GM part number 7022945.  All linkages and butterflies move freely, not frozen up. This has been stored in my dry garage for the last 40 years. This should be gone over and new gaskets installed. I searched the number on this carb and it looks to be correct for 63-69 GM straight 6 (230, 250). Butterfly size is 1.570"

Any questions please ask