Old Air system question

[jackyl9999]

Hello everyone. I just got my old air A/C system charged and running in my 70 GMC. I am currently trying to run all the cables and vent hoses. I have a couple of questions. Any answers or pics would help me alot.

1. I have the defrost/ Air lever hooked up that moves the air between the dash vents and defrost vents. What do the other two cables hook to?

2. How does the center dash vent hook up?

3. How do the defrost hoses run?

These may sound like dumb questions but I have never knew much about A/C systems, so excuse my ignorance.