The motor was rebuilt in 1994 and was still in the plastic wrapper when I bought the car. They decked the motor so I have no idea when it was assembled. I found the vin by the oil filter. I tried some muratic acid on the pad and it looks like it could be raised but I did not want to mess it up, they had no idea what they were working on back then, they even stamped their company initials and rebuild date on the heads and block. I know they fake numbers on the pad, anyone do it on the rough area by the oil filter? I am sure this is the original motor, just curious. Anyone in the phoenix area that knows how to raise numbers are welcome to look this over.