I agree, if you want all around performance the NV4500 is probably not the best option. They pull good, but just aren't really a performance tranny.
A T56 however is an absolute blast.
Mine is in a 2wd old style.
It's just an opinion, but much more fun to drive than an auto.
'92 Fullsize, swb rc
5.3L/T56 conversion, comp XR275 HR cam .566/.568 lift 222/224 duration 112 lsa, crane dual springs, trick flow push rods, K&N Filter, Nelson Performance tune, Keisler shifter relocation kit, Boyd Coddington Smoothie II 18x8 235/55 up front, 18x10 295/45 out back, 2/4 drop, eaton lsd w/4.56 gears