Date code is April 1964, perfect for your 1964 1/2 Mustang or other Fords. Block casting C4OE 6015-C, 5 bolt bellhousing bolt pattern, complete from oil pan to intake, exhaust manifolds, C5AE aluminum water pump, alternator, mount brackets, crank pulley, distributer & coil. Engine has been sitting a long time, but is not stuck!