Here is some good info to gauge as far as vin # to date . I have a 440-6 motor out of a 70 v-code roadrunner vin # is A0125336 casting date is 8-12-69 assembly date is 9-18 hp2 . Hope This helps .If anyone is interested I will sell it. The top end I sold years ago. The bottom end is standard bore never apart true pack motor.