Being an '86', your A/C system uses the old r12 freon. Your first challenge if you want to use/repair the exsisting system will be to find anyone who still possesses any r12 freon to charge the system and check for leaks.
Once you've tried and failed, you'll need to find a shop that will do a complete retrofit of ALL the old A/C components, to use r134a freon. A new compressor, reciever/drier, orifice tube, condensor, and probably most of the plumbing as well. I can tell you this will run well over a thousand dollars to do.