It looked like the one Paul had for sale from elk grove mustangs.
If that's the same car the air will just need to be recharged.
He had to disconnect it to replace the parts he had on there.
If the ac works, and everything else works, sounds like a good deal.
Remember, as with any used car of that vintage, have some money available to perhaps do the brake pads, and some other wear stuff, perhaps tie rods, and alignment.
With a used car, I recommend buy it, drive it for a week or so, and then start fixing all the normal wear stuff, so that you get some troublefree miles and enjoy it...