My worthless two cents…
Its your car, do as you wish. The suggestion to install Vintage Air makes good sense, pretty much a 'bolt in and go' deal. No searching for old used parts (who knows what condition it will be in), and spending more money restoring it. That said, IF we were talking about an original DZ 302 Z/28, I would NOT do it. Its funny, the guys over at the Boss 302 site are discussing this topic "Should I install A/C on my Boss?" Again, I would say: NO!