Vacuum Diagram for Air Conditioning 70 Chevy Pickup

[stringpickin]

Hello and Good day guys.. Does anyone have a diagram of the vacuum hoses for all of the air conditioning hook up. To include from the AC controller, the two vents, one in the cowl, the one in the right hand passenger side panel, the vaccuum canister? And I believe their may be one more unit of some type that has something to do with the system. The guys at the shop are trying to get this working for me, but are having a lot of trouble.. If you have specific knowledge and could help me, i would appreciatte it so much. I will gladly buy you lunch and pay for phone calls so I can get this figured out. Either case, a diagram or expertise would be greatly appreciated.. thank you very much. Appparently they have exchausted all sources trying to get the proper diagram. All they have found so far is what goes back to 74. thanks again..