You are bidding on a used Carter AFB four barrel carburetor from a 1964-67 Pontiac V8 engine.  The I.D. tag is missing (why dies someone always have to throw it away?), but the large fuel inlet pegs it as being no older than 1964.  The guy who I got it from had several 1965-66 Pontiacs in the past, so it's most likely off of one of them.  The carb is complete, and the throttle plates, adjustment screws, metering rods, and other linkages move freely.   It looks like a good rebuildable unit.   Happy bidding!