1967 A-body Big Block 383 4bbl 727 Automatic Transmission

Apparently you don't have the gurus book it states 66 & 67 example 10,000 dates do not apply. Yes i have seen many factory problems in the few hundred cars i have owned and documented in the last almost 40 years and if this date number is not as it should be i am not surprised and it has not been altered by me or anyone previously that i can tell if that is what you are trying to suggest! I have seen all kind of factory screw ups even with body vin sequence stampings out of order, and plenty of them on engines and transmissions 1 or 2 numbers off, no numbers and many other mistakes. Just because you have a few transmissions with dates what you believe to be correct does not mean that the factory did not make mistakes on the numbers. You could have hundreds without mistakes and then you could find a few that do it happened!