[john]

Make sure the tranny is perfect. No grinds at all or any sticking before it goes in gear. Do a compression test to see how good the bottom end is.
What are your goals for the car? If it is just to hang with a neon you could even buy a 2g. You would not have to worry about a 6 bolt block or a four bolt rear.
Why did you limit the search from 90-93? Why not 90-94? Best year is a 92 with 6/4 but dont have it be your deciding factor weather to buy one or not.