Help please - rebuilding original AC car w/o AC

I've done searches and reading of prior posts but I could use help with my specific question. My 71 Dart was originally a factory air car. I do not have any of the under hood AC parts except the heater control valve so I'm trying to set up the heater/AC box to function without the AC components. I've got the dash disassembled for cleaning and am restoring the heater/AC under dash unit. Question - can I reassemble the under dash unit without the evaporator, connect all the original vacuum hoses and diaphragms, the heater control valve, and the AC dash heater controls, and have a functioning heater/defroster?

Much thanks in advance for your help.