if you have a vacuum disconnect axle your only option for 297/760 shafts is '95 YJ shafts, or you can get rid of the disco and run a long shaft from TJs or 96+ XJs. There are some things (seals?) that need to be changed to do the later, do a search.
there is no need to run 297/760 joints for many people, what size tires do you have, locker in the front, type of wheelin? I never broke a 260x joint with an open front diff, 33s, wheelin rocks at Fordyce and general NorCal trails, and downright abusing it (though I did carry spares). If you plan to stay 33s or smaller with an open diff you can just leave your shafts the way they are and replace your unit bearings alone (get Timken bearings!)
As for the Warn hub conversion, I consider it a serious waste of money on a D30. if you have the 231 t-case you already have the axle disconnect so your driveshaft isn't spinning in 2wd. I have heard of strength issues with the 5on4.5 warn hubs also.