This is a Holley Carburetor for a 1966 Chevelle 396/360hp Automatic transmission L34. This has been rebuilt. It is overall in solid condition but has a few defects. It has been surfaced but it has two areas of deterioration on the underside. One threaded tab has also be cracked and broken off. None affect the structural integrity of the carburetor or fuctionality. Date code is 5O4. Part number is 3886088 EX and 3420.