Visit this site www.shotimes.com
they have a section all about what to look for.
Big key is to find out if it has had the required maintenance done.
If the 60k service wasn't completed at all, the car is a crap shoot.
Check to see if the year, and front bank of plug wires has the original stamp of Ford, and the year of the car on them. If so, that means the wires are original. Most likely the plugs, timeing belt, gaskets ect...are all original.
That is a good indecation of neglect.