From the what it's worth department...I have a 70 th400 L78 Nova that has an earlier VIN # but later date on engine stamp. My car is a 3rd of Jan with a 12/18/69 engine stamp. This car has a 11/01/69 engine date with feb rear stamp and trans with late dec date...??? maybe I have the #'s confused, but it seems a little strange. Would like to see cowl tag..I also have build sheet to confirm VIN with body #..maybe Greg can sort out the numbers..
wilma