1971 for sale.

My dad has had a 1971 Camaro since the late 80s. The original owner was his uncle. Was from Florida Georgia area. 350 factory air. White with Black Vinyl top. Been kept in garage always here. 103k original miles. He is talking about possible selling. Any idea what kinda money he could get for local or a online auction type thing?
Trying to help him out with some info. Thanks