Whatever you do, don't auction it off on eBay, as you'll never get what you're hoping to out of it. Autotrader or something similar's the best method, I've found. Think of your ideal selling price - $8,500 sounds like a good, solid number - and place the actual ad price for about $500 over that. It used to be sort of a "trick" in buying a car to try to talk someone down on their price, but nowadays people just EXPECT you to dump $500 off your price no matter what (some ballsy/inconsiderate bungholes will try to lowball you by hacking 1/3 off the price and using the old line "I've got it all in cash, right here, right now!"). So, maybe price it for around $9,000 and see how it floats.
FWIW, some other general car-selling tips that I've learned (I've owned/sold 17 cars thus far in my time, so I've had a bit of practice):
- Never settle for anything but CASH. No payments, no checks, no half-this-and-half-that crap. Even a cashier's check can be forged with a good printer. If they absolutely must use a cashier's check, drag them along with you to the bank to make sure it clears.
- ALWAYS have 'em sign a Bill of Sale, stating "SOLD AS-IS." Dunno how the laws are in your state, but some places may have open loopholes where jerks can buy a car, tear it up, then try to sue you for selling them a "lemon."
- REFUSE to let someone try to talk you down on price on the phone/e-mail, or before they've even test-driven the car. They're usually not serious buyers, and/or they don't have enough dough and it'd take a miracle for them to scrape it all together. (These are usually the turds that try to talk you down to $5,000 on a $8,500 car.)
- The more you know your 'Stang, the less likely you are to have some crafty dude try to convince you there's some terrible mechanical flaw in your ride that should devalue it by a grand or more. "Oh, that knocking sound is your lifters. It's gonna need a whole rebuild soon!" etc.
...and lastly...
- Sell those Pony rims separately. Preferrably to me. For a nominal fee, of course.
But seriously, don't just throw those in with the car. Those, and any leftover stock parts of good use, are perfect eBay material - maybe not a huge chunk of change, per se, but it's better to score a few extra bucks on the side than to just give 'em away with the car.