AC on a slant 6 motor.

I am slowly collecting parts to install " factory" AC on an 85 D150 with a /6. I have a combo of new and old parts already, I am still needing a few more things. I'm gonna have to dig my factory 84 and 85 factory service manuals on CD plus my 80 paper copy FSM out and compare them all to see if I have it all.