I wouldn't let the speed density thing scare you it's not a factor until your ready for a big cam otherwise they were faster stock verse stock against the later maf foxes (89-93).
Anyways im on board with the rest of the guys though, i'd consider what purpose or goals you would have for the car then go over the car real well.. let it get to operating tempature, drive it for a little bit, let it idle for a while, drive it some more. Pay attention to how the trans shifts and listen for any noises from the trans or rear end. Check out the torque boxes for damage or cracks as well as the floor pans. Check the common spots for rust or in this case since it's a repaint some bubbling like under the hatch, by the back tires or front wheel wells and check for stress cracks on the roof which would show signs of body flex.
Door handle and hinge is a common problem with these cars as they get older and older and can be solved cheaply in most cases. Just remember parts for these cars are everywhere and anywhere and aren't too expensive it just all comes down to what I said earlier, what's your goal for the car? weekend warrior, a project, daily driver or all of the above lol
