I made a seemingly interesting discovery. I had my motor pulled for a fresh up after 25 years of driving and learned the engine stamped assembly date is 5/12/65 The vin# is stamped on the block also. My car data plate has a build date 5/11/65. The block cast number is C5AE-6015E w/ a date of 5E7 I suppose this anomaly between the engine assembly number and the data plate was common in 1965?
Thanks, Steve