This post brings back a terrible memory. When I was ~17 (Late 90's) there was a similar situation where an older lady was being moved into a retirement home and her children were selling many unneeded things.
She had a 1973 Nova as well, a green 4 door with a white vinyl top. It looked mint, the tires were original and dry rot was apparent. It was kept in a heated garage since they purchased it new. They were asking $600, I was unable to get a ride to the bank until the evening and before I had a chance the hillbillys next door purchased the car. It had 8,000 miles on it I later found out, they put about 100 miles on the car before parking it in their barn and disassembled the windshield wipers in an attempt to repair them.
Its still sits there to this day, its under a roof but still is exposed to the elements. I look at it every time I drive by on the way to visit home. They put it up for sale from time to time for $8,000-20,000+ as they are convinced it is some sort of valuable time capsule, time is catching up with it though as I see rust forming in the wheel arches.
If it is ever sold for a reasonable amount I'll buy it and have a fun project.