Pontiac 1974 engine block # 488988  350 but on top marked 50 it is 350 displacement.. The man that owned this started to rebuild a Pontiac GTO this was the engine he was going to use . He passed away unexpected so, his estate was liquidated . That's all the history I know on this engine . Review all photos thanks Tony ... Also pick up only on this item if you set up shipping I can take to a LTL carrier in Springfield mo only to help assist you in shipping ..but winning bidder must set up and pay all shipping cost to your location ..