Well j-d, now it sounds like the way to go is with a Nippondenso, stock condenser and a couple small 12v fans to move air around. Is the 6P148A the only one that will work, or could I source any Nippondenso from ebay or a local pick-n-pull?
How about this one I found on ebay? It's a rotary and designed for a Ford E350. Looks like it might even work well with the existing York mount.
http://www.ebay.com/itm/Universal-Air-Conditioning-CO101200C-New-A-C-Compressor-KIT-submit-vehicle-info-/271209176886?pt=Motors_Car_Truck_Parts_Accessories&fits=Model%3AF-350&hash=item3f25539f36&vxp=mtr#shIdJose
