The engine side of things is pretty easy. You need a set of V8 frame horns, motor mounts, and block mounts from a V8 CJ. OR, as I did, get a set of bombproof V8 mounts from Mountain Off Road Engineering (super beefy). Pretty sure you will need a different bellhousing for the NP435, but there is a stock one that will work. For the Tcase you will need an adapter to mate the Dana 300 to the NP435. For that, check out Novak Conversions, http://www.novak-adapt.com/catalog/kit_433.htm
1985? Jeep CJ-7: 360, 999, D300, LOMAX 4:1, Dana 44s, 4.10's, Aussies front & Detroit rear. S0A, York OBA, YJ tub, 36" IROKs-
1989 YJ Sahara: 258, puko tranny, np231. 2-3" spring and 2" body lift. 33" TSLs- latest project.