You are bidding on a used Holley list number 80457 600 cfm vacuum secondary four barrel carburetor with an electric choke.   The carb is complete, and the throttle plates, adjustment screws, and other linkages move freely.   As can be seen from the pictures, it's grungy on the outside, but nice and clean on the inside where it really counts.   As with any used Holley carburetor, all of the gaskets should be replaced before use.   Happy bidding!