At first glance, it looks like a decent car, possibly worth 7k. What would your plans be? If you're trying to flip it, I'd look at something else, I don't see 66 coupes moving fast for much more than that. If you're keeping it or restoring it, I'd get underneath it with a light and really scour around for signs of rust and repairs. Check the rubber suspension parts, see if they're cracking, check for leaks or drips, and anything else while you're under it. Also stick your head in the trunk and look up, and around the gas tank, these can be rust problem areas. These aren't necessarily deal breakers, but good to be aware of and possibly things to negotiate over. It would need to be well sorted to be worth $7k in my mind, but do some research on what they're fetching on eBay and CL.
You can't get a Marti report on a 66, but at the very least decode the vin and see what the original engine/plant/color it was. Also consider a compression test to be sure there are no engine surprises.
Apart from that, the usual things before buying any car - test drive it and inspect the hell out of it. Good luck!