Hi and good luck with your upcoming purchase. Just from past experience I'd say the biggest, most important thing is to look for RUST. I know the rust gods are easier on sheet metal way over there in NV versus here in Maryland. But, the better the shell, the easier the restoration.
Second, I'd say look closely for wiring problems. Crawl under the steering column and look at all the connections. If you see a bunch of hacked up wires plan on a nightmare.
Third I'd suggest you decide if you are going to RESTORE (back to original) or rebuild it using parts that you desire (go fast goodies, PIA headers, etc) to see on the car. if it's RESTORE then you want to look for a numbers matching car that retains as much of the original stuff as you can afford.
Most folks buy an old TA and start yanking original carbs, intakes, heads, etc and stuffing the engine compartment with aftermarket goodies only to decide later that original would have been better. So,if you start that route...save all the stuff that is original to the car.
Most of all have fun and make it whatever your vision for the car may be. In the end you'll be happy with what you have.