How to tell what a 360 originally came from ?

crackedback said
Didn't full vin's stop in 1969?

It may have a partial vin and you may be able to narrow it down based on cars produced at certain factories.

Im not sure when they stopped full vins.

It really isnt going to matter what it came from originally anyway. The year it was built and the casting # of the heads and intake will tell you everything about it.