Looks like you have mainly old aftermarket components, but the evaporator housing appears original for factory-equipped AC.
That compressor is really odd. As mentioned, it looks like an older GM "pancake" style.
I'm sorry but I don't think you're going to be able to make a cheap or easy fix on this AC system as it sits. It'll be tough, maybe impossible, to find an exactly-the-same replacement compressor. Changing to a different style compressor would be complicated by having to put together a proper mount and drive, which are the parts and brackets that fit that particular compressor to your 2.9 engine. If your toasted compressor is rebuildable, and if you can find a place to do it, that may be an option, but it's still a crapshoot and money spent.
Another issue will be the refrigerant charge. I suspect the system may have had R12 in it (the drier is dated "AUG 21 1988").