Check Standard transmission at 1-800-std-tran. I think it runs around $1600 +500 core. That price includes their fully splined mainshaft kit already installed.
Others have done this swap, and if you check the TDR classifieds I seem to recall a bellhouisng for sale. Your clutch and flywheel will work, but you might have to machine about 0. 06" off the end of the hub on the clutch disk, or off the end of the NV front bearing retainer so they won't hit. Depends on which bellhousing you get.
I have a spare 97 model 4wd 4500 but hadn't thought about selling it. . .