What model/year is that 80 Series?
How is the interior?
How is the paint (fading, peeling, any paint "bubbles")
Any hints that the head gasket has issues? (overheating, funky radiator fluid, has the owner used any head gasket or block sealer?)
A couple of tires appear underinflated, says something about the maintenance (or lack thereof).
We need a lot more photos to give a better opinion.
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Been discussed so many times, best route might be to ask the seller if you can have it inspected but take it first to body shop, preferably one with a lift,
and ask them to check it for rust but ask for an actual estimate for rust repairs and ask if it will pass a State Inspection.
Then take it to a mechanic who can take his time and ask him to put it up on a lift, ask him to look for rust and mechanical issues including tests of the cooling system/head gasket. Will cost some money but you'll have something to go on.
You cannot assume the AC system is just a compressor issue, very likely it's more than that ie: $1500+ for repairs.
Otherwise we're all just guessing.
The main thing to consider, you and the vehicle are in Pennsylvania, one of the worst areas in the US for rust IMO. So either deal with what's available locally
or find one in a dry/salt free state, then fly out, drive it back, but have the vehicle professionally rust proofed inside and out before the first winter in PA.