Re: 1987 Chevrolet Contempo Camper Van
That thing is a rare beauty!
The good news is parts should be inexpensive, although it's been many a year since I had my old G20. I put an used engine in it in Texas for less than $1000 and later a new (salvaged) rear end, otherwise it was minor stuff and the engine was bad when I bought it (I have a knack!)
My only concern would be top and canvas condition, not from the photos, but just that with a system that old it might take some creativity to maintain.