You need to really go over the car...like with a comb. Seriously. Look at everything, the frame rails, the floors, the rear sill, the rockers, all that stuff. The car is 40 years old, and if it was garaged the entire time, it would be going for a LOT more than 10 grand. Just make sure that if you're going to spend all your jack on it, that you'll be happy knowing there will be no surprises. And there are always surprises.
You need to get on it, see if it has a posi or not, see what the engine does from a cold start, and what it sounds like, both cold and hot. Check for laks and the obvious stuff.
If you are going to keep the car, like for a long time, it doesn't matter as much what the trim tag says. Restoration guys and collectors can tell you exactly how the car left the factory by the codes on that tag...the one on the firewall/cowl area on the driver's side. If you ever planned to "flip" this car or expect to sell it for a lot of $, it would need to have been a pretty well optioned car, with the original engine, trans, all matching numbers, etc.
If it looks good, go for it and don't look back. If it makes you nervous, run like the wind. Then go home and start looking for another one.
Welcome to the site, by the way...my name's Jake.
