If you're not concerned with originality, I'd go with an aftermarket A/C system like Vintage Air.
The parts to restore the factory A/C would be expensive and hard to find.
Plus, with that evaporator box in place, the valve cover gasket and spark plug servicing on the passenger side goes from an hour or two to an all day job. You can get the non-A/C firewall assembly that just holds the heater core and blower motor, or call up Vintage and see what is needed.

All depends on what you want and how much you want to spend.