Restore factory ac or go aftermarket

I just purchased a 72 Dart with factory ac. Most of the under hood pieces are missing and the system has been sitting open for years. The blower motor isn't working and no clue if the controls or anything else works. I have been looking into using new components under the hood, but inside is it worth cleaning out and restoring the old evaporator and box or do I need to just get a new aftermarket under dash setup and lose the factory stuff?