I'd be looking for axles. 1/2-1T's. Dana 44's, 60's and Ford 9's. York A/C Compressor or a OEM Sanden. Maybe a spare windshield frame with glass. Hard top, Full doors, half doors, CJ rear tailgate, CJ front clip. If there are any big rig's then air tanks.
Ford Design III injectors in 19, 24 and 36psi. Ford V6 and V8 electric fans.
NV231-D out of a Dodge. If they have a RAM 1500, you could see about getting the engine (316), transmission (NV3500) and transfer case(NVG231-D) or salvaging what you can from it for a swap. NV4500's would probably be a rare sight but you might find one in a Dodge or Chevy 3/4-1T.
Basically, keep an open mine and look at everything while you're there. Some things jsut sort of pop into your mind while browsing.
Dikes (diagonal cutters) would be helpful as well as a hack saw. Cold chisel, 3lbs sledge, impact driver. Box and crescent wrenches as well as sockets, extensions, universals, breaking bar with pipe extension.