[bwana50]

When I moved my residence to AZ, they were mainly checking just to ensure the car actually matches the paperwork. So, if it's a '65 now, they should register it as a '65.

There should be an advantage in that AZ MVD bases part of the registration fees on age of the car, and the cost depreciates over time. For a '65, I think you're at the minimum cost level.