I know it's very similar to installing A/C in the 1st gen 4Runner's and later 80's pickups. Here's a thread I did when I installed A/C into my 87.
https://forum.ih8mud.com/threads/how-to-install-a-c-in-a-1st-gen-pickup-4runner.1210923/
You'd need to find a parts truck with everything you need...