Buying a 73z w/o a/c but need it. Is it better to upgrade with another car? Any specifics of what and how or where to find good info would be appreciated.

 

You may want to contact someone like Vintage Air, I have heard good things about them.

 

I have a 74' 260Z and bought one out of a identical car that had been wrecked. I think I paid $75 BUT it was beyond my limitied mechanical abilities to install it. It ended up costing me (are you ready?) $500 for a shop to do it. ouch, but since I'm in AZ I needed the a/c.
good luck