$5,000 max if you just drove it for 7 years.
How's the headliner?
Leaks water through cowl when it rains?
window seals not cracked?
Rust around rear window? Quarter panels?
The engine is only interesting, not stock.
I need more info. Do you have any pics and what kind of engine/trans does it have? Is it all original?
If the car is complete, has nice wheels/tires, and primer gray, my rough estimate is 8-12 grand with a full interior in good shape. The built 302 engine is a plus. I'm not sure if it's a fastback or not.
That depends on the body condition , interior condition and the miles on the motor , and motor condition . A person who is looking for that particular make and model might pay more than regular person . Check the Kelly Blue Book price and go from there .