IMO, The vinyl mold may be from the heating up of a cold garage and causing condensation mixing with dust continually with the lack of cleaning. Oxidation on the steering wheel and valve covers seem to suggest it to me. I know if my garage temp is 20-25° and I open the garage door to let in 45-50° air I get condensation. Either way though it's a recipe for rust and rot.
It's surely out of my price line, but before looking at it, I think I'd request trunk and frame rail pictures along with title information.
Low clutch peddle=diaphragm clutch sitting since '83?