A friend is seriously looking at a '68 Dart GTS 383 4spd car. Two things that concerned him was that the six numbers on the lower right corner of the fender tag don't match the last 6 numbers of the vin tag. Should these always match? And second, the numbers stamped on the 4spd matched up until the last number, it should be a 6 but it's a 9. The ownwer told him that he thinks "the production employee accidently held the stamp upside down". I've never been a numbers correct kind of guy so any help would be appreciated.