well shit they are old cars so body rust will be an issuse
tranny probably will need rebuilt especially if you going to put power to it.
full shift kit and new stall convertor.
the 87s are the best model to get.
its all in what you can get.
different chips can cause issues by adding to much timing othere are way to safe its hard to keep up with all the bs.
just basically have to drive the car and see how it acts.
most of them are good solid cars just its all in how they were taken care of.