Most will tell you it's not worth much because it's a coupe. I don't agree completely, but the market dictates value. Which engine does it have? If it's an S code 390, I'm sure it would be worth it. What options does it have? A/C, console, deluxe interior, all add value.
Mine's probably a 9 out of 10, and I probably paid too much for it. And it was more than 11K, I'll admit to that.........
I wanted a fastback but they seem to be extremely rare and expensive around here, but 67 was my favorite year.