A/C compressors, again

["Joe Costanzo" <joe_costanzo@domain.elided>]

     Fellow Binders,
     
     I'm planning to do some rummaging in a large junkyard in eastern PA 
     this weekend, and one of the things on my "wish list" is an A/C 
     compressor & brackets for adding on-board air.  I know there was a 
     discussion about this a year or so ago, but unfortunately I lost my 
     saves when our email system here crashed.  (Some of you won't be 
     surprised to hear that.)  Anyway - I understand that there are several 
     different "size" (i.e. output rates) compressors that were, if I 
     remember correctly, made by York.  Also, I believe that York 
     compressors were also used in Fords.
     
     So, for maximum air output, what specific compressors might one want 
     to look for?  Is it necessarily true that a large Ford van might have 
     a larger compressor than another '79 Scout II that happened to have 
     A/C?  Is the pulley on the Ford configured for the same belt that 
     would wrap around my crank pulley?
     
     At this point, I'm going into this somewhat blind (although I have 
     seen a few setups on the web), and I'd like to gather a little info 
     before I go looking for my next tetanus scare.  Any info is 
     appreciated.
     
     Joe Costanzo
     '79 Scout II
     
     PS:  I'll let you all know what sort of IH supply exists at the yards.