Original owner of 71 Twister "considering" selling car

It pains me to say that I'm "thinking" about selling the car that I ordered from the factory in May 1971 when I was 19 years old. My car has required a spot in my garage for over a year because it has a couple of leaks that I've not taken time to fix and my car cover is not water proof.

My question is this: Aside from the condition of the car - how might the fact that this is a one-owner car affect the asking price? FYI - I've maintained the car for personal use but nothing fancy for car shows.

A related question: The original sales receipt has my mother's name because, at age 19, I wasn't the one that the acquired the car loan. (Funny to think that it took me 4 years to pay for a $2700 car.) Does my Mom's name on the sales receipt negate the car's status as being a one-owner car? I'm the only one that drove the car - my Mom wouldn't have picked a car labeled as "high-impact red" with a 3 speed manual on the floor.

Thanks,
Ken