[Iwantata]

I just joined this forum a week ago (said my hello's in The Lobby) and I'm hoping to join the Trans Am owners club shortly (I owned a 1975 and 1979 Anniv. cars previously). I'm now looking at a 1973 TA which is not numbers matching, but the engine has my baffled. It's a 485428 block (still to be confirmed) but the stamp pad on the front shows 210982 (car VIN ends with 102942). Also a YA underneath and a larger 03 stamped alongside the YA. Except the "3" in the 03 is backwards, so it looks like a 30 upside down. Can anyone tell me when the 210982 was stamped and possibly from what car?

Thanks very much for your time