The market right now is really hard to quantify. I watch things on a weekly, if not daily, basis. That said, I see a lot of foxes starting off with lofty asking prices only to greatly reduce them or to leave them indefinitely on the market. It's hard to tell what people are really paying. Yours looks like what you state, and the pics aren't greatly detailed. So, it's a stock-ish high mileage '89 GT, and that you're in Tennessee. Without further data and assuming the best about the car, I'd guess this would sell for $6-7k. That said, the market is kinda crazy. So, if I were listing it, I'd probably ask $8-9k and move downwards from there, if it didn't get people to come take a look.