Up for auction is a NOS 1966 Chevrolet Impala Chevelle fuel pump for the big block engines. This is the fuel pump for the 396/375 and the 427/425 engines. The AC Delco part number is 40358 (shown on part in photos). The GM part number is questionable. I think the GM part number is either 6416458 or 6416158. The plating is nice. Overall, the fuel pump is in excellent condition. New and ready to install on your ride.