Keagan,
when we get to Monster Mopar in June I can turn you on to a guy who will know. He will be at the Indy show at the end of the month, but hard to say when. He seems to know about all of the dealerships on the western side of Ohio.
I don't what all he can tell you, other than where they were and who owned what and bought what out. I doubt any records exist. New car sales records only got a 3 to 7 year life before they were destroyed. Usually depended on the warranty and/or service contract that the car came with. Didn't have computers back then, every thing was on paper and that took space, which was a premium.