Well, I don't have any 4cyl specific recommendations, but just a general used car shopping checklist: check all the fluids, the brakes, noise / vibrations that seem unusual / excessive. Rust check- look for corrosion anywhere out of the way, pull up the carpet to look underneath, crawl under it with a flashlight to look forexcessive rust and fluid leaks.
Didn't see anything about an axle upgrade, so if that's a Dana 35 rear it's my understanding those 33's are about the upper limit of how large a tire one wants to run with that axle. (Dana 35 has a rubber fill cap). Also, might want to ask about the gears- if that is on stock 3.07 gears with those 33's it might be ok putting around town but inadequate for anything more than that.
Price seems a little highball to me for that year and mileage, but it does look like the owner has done some nice mods. My $0.02.