cars selling dealership ?

build cards which had the dealer info on them. 67 and earlier can be had through Chrysler Historical. 68 to 70 are toast from a fire. 71 up I am finding to be questionable.

You could try here http://www.hamtramck-historical.com/found.shtml
Barry has accumulated some dealership documents. Perhaps you may be one of the lucky few to have something in his files?

Other than that tracking ownership through DMV back to the original owners.