coming from me , ive owned my AE82 for 6 years and the first thing i would do is a full service including a radiator flush , new oil leads plugs coolant gearbox oil the works , if you can do it yourself it won't cost you much and it's worth every cent. You have to work out what you want from the car? if you want it to handle , be quick in a straight line etc etc . some 15" wheels with semi decent tyres and something along the lines of new springs or shockers or both will definatly help it , if your more into just a nice little cruiser whack some second hand king springs in it , leave your pod on and put a cat back system on it and just enjoy the car , it's a very open question without knowing what engine the car has etc etc.