Check this out, a VIN decoder tool for 1960-1969 Pontiacs:

http://www.1963pontiac.com/tools.htm

I haven't had a chance to run my '69 Executive'* VIN yet, but it seems like a cool utility!

Pretty helpful link...too bad it can't give you a breakdown of the motor option that the car has....sure would be helpful to verify originality if you are looking at cars where the owner isn't sure of the motor. Good link though!

I got a second one to add to that list, will post it when i get it from home. I use it in my never-ending QUEST TO FIND A:
1965 / 1966 BONNEVILLE CONVERTIBLE
with 421 engine!!!!!!!!!!!!!!!