My cousin and I own a 1973 Pontiac Catalina (Grandfather's car). 54,000 original miles. Garage kept and covered until about 5 years ago and the last 5 it has been under a shed. Interior is immaculate and good paint on the outside but some light rust starting on the trunk where it was stored under the shed. Runs great. We just simply have no place to store it and have decided it is best to just sell it. I simply have no idea what it is worth or how to price it. There is not a Kelly Blue Book for this sort of thing.