This is an original 1959-62 era Buick Nail Head V8 4bbl Rochester Carburetor.  Pretty good looking condition, not stuck, moves good, looks to be a good core for rebuild-see photos.  This came off of a Buick 401ci Nail Head V8 engine w/ a Wildcat 445 Air Cleaner on it.  There is no tag, so I'm Not sure of exact years, models or engine sizes this may fit.  Please check my other auctions.