Josh, welcome to our little clubhouse. I have given this much thought myself, adding factory AC to my non AC convertible. If you find a parts car to strip, besides to obvious, don't forget the following: you will need to cut a large opening in the firewall for the evaporator assembly, engine wire harness, under dash wire harness, crankshaft pulley, dash master switch assembly including all vaccum lines, compresser brackets, fan shroud and clutch fan and spacer. It will be quite an undertaking for sure. Have you considered an aftermarket AC conversion? It might be less of a challenge and you will get a modern cooling system. Has anyone else done this before? Either factory stock or aftermarket?
Best of luck to you,
John Egel