That is the same swap I'm will do later in my 86 CJ. From what I have measured, once you drill the new holes on the AW4 or use a clocking ring, the t- case is about 2 inches further back (than my T5). I too don't want to cut the floor as I have the factory console there. So what I'm doing is moving the t case pivot forward and extending the two shift rails with bar stock of the same size. It will them come up in the old location and shift the same. You'll need some fab tool/ skill though as it's all custom.
1975 CJ-6 1983 CJ-8
1986 CJ-7 Laredo 1986 TJ-7 Trail Jeep
2003 Inca Gold TJ Rubicon