A/c evap

The vacuum hoses are on the "climate box". The evaporator is one part inside there. Others are the heater core and vent doors. Sounds like you have the vacuum-operated climate box which uses a 5-button switch. You can get parts to refurb that. Some cars came instead w/ manual controls (cables). Not sure about 1972, but probably not a smart swap anyway since some of the dash also changes, and why downgrade. You can get a complete after-market stand-alone climate box from companies like Vintage Air, but I think require some re-plumbing of the AC and heater hoses in the engine bay.