1969 chevelle VIN number Help !

[chevyman0429]

So like most iv always got and eye out hoping my original block for one of my 69 chevelles would show up. Yesterday I got and email from a guy in Oregon that says he has a JA coded A-10-69 built 396 block which has the Z stamped and the vin number is one digit off from my cars vin. My car was built out of the Fremont plant (z) has a build date of 01D and was sold out of California when new. The last number on his block is a 1 and the last number on my cars vin is 7. I guess what I’m asking is do the vin numbers run that close that there is/was a 69 chevelle out there that the vin is exactly the same except the last number. Could they have used a 1 instead of the 7 . Could this by my cars original block ?