Hello everyone, I just got a 455 engine that has been machined and is ready to be assembled. the motor is going to be installed in a 73 Gastron Carlson cv-19 jet boat, anyway what I'm wanting to know is if anyone can tell me the year this motor was built. the only numbers I found on the block is to the rear on top and one is 455 and below that is 1241735. Any help I can get will be appreciated and I'm looking forward to being a part of this forum thank you jim