You are bidding on a used Holley list number 8679 650 cfm vacuum secondary spread bore four barrel carburetor.   The carb is complete, and the throttle plates, adjustment screws, and other linkages move freely.  As can be seen from the pictures, it's clean inside and out.  It was intended to be a bolt on replacement for Rochester Quadrajet equipped vehicles.  As with any used Holley carburetor, a rebuild kit will be in order,  since all of the gaskets should be replaced before use.