1972 Heat & A/C controls

[smokenjoep01]

I have my entire a/c box heater box etc. removed from the car. Ther are alot of things that I have concerns about. I want to make sure that I try and eliminate any potential failers down the road.
Like I am going to buy a new heater core and blower motor. There are lots of round diaphram looking things with vacumm lines conected that go to the flappers in the kick panel, cowl panel, heater box etc. What are they? How do I test/refurbish or replace them? Should I lubricate the cables to the controler. The pivots are rusted to the flpper things. Can I wire brush then and paint them? Should I replace all the vacumm control hose? Were would I buy them. Could I test them and reuse them if good still? Should I do something to renew the climate control selector?
Whats the best route to go on A/C? Its a factory air car and I want the air to work, and to work good. Classic air has some update kits
Im sure I will have more questions and have forgot some other questions.

Any suggestions about any of this are welcome. I dont want to have to be replacing stuff once she's all buttoned up.