A/C Question

[DizzyD]

Hello all, been a member for a few months and have never really posted. Just get some pretty cool ideas from all of your builds and try to apply some of your savy to my build. Im a bit older (28) and have always wanted one of these squares, so a few months ago I decided to start up a little project so my old man and I could spend some time together. I'm looking to pull the trigger on a parts truck to supplement some of the needs for my 1978 GMC project. My main interest is the A/C system and want to see if somebody can educate me as to whether the A/C system from an 85 3/4 ton will fit into a 78 1/2 ton. Any info is greatly appreciated.