1970 Dodge Charger

What kind of document would that be? It would be like documenting that your drive train and interior weren't stolen...
but I understand the question...

I actually talked to Idaho DMV about all of this and wondered since it was a body swap should I actually apply for a state VIN?
They looked at me like I had a clown suit on, could have cared less....and really couldn't grasp the body stamping thing at all. Without a 17 digit VIN (like new cars) there isn't any database keeping track of our old cars.

It's a re-body plain and simple.