I have had the shortblock sitting since 1989. Heads are powerpak with triangles over the flats. The heads were off the engine out of my '57 chevy pickup, and carry 1956 dates. They have been sitting since around 1975. No side mounts on the block. It does have an oil filter boss. Engine ran ok when removed, i think it may be punched out to 301 ci. Been in a plastic bag for the duration. Heads are complete. 602-510-2519 Hillenger512@cox.net If you think you need it bad enuff, make the trip to pick it up. Thanks Chris