8" is alot of lift to be usign the stock steering parts. Might not be a bad idea to go with an aftermarket drop pitman arm for the steering anyway. 4wd steering boxes have 1/4 of the sector shaft splined and a pinch bolt holding the ptiman arm on. Is that how yours is? If so I bet they will interchange.
While you are converting you might also want to look into "crossover" steering. You need a 2wd sector shaft and different pitman arm for that. I just finished converting my 71k5 to crossover.