There are a number of tranmissions that will work with the right adapter and some $$. But then you might also need driveline alterations and so on. If you want to go cheap, look for a T4 and change the input shaft if needed. Or a T176 will bolt up, but drivelines will need to be changed. What about swapping in a AX15? It will bolt up with some minor alterations and a clocking ring. Or a NV3550 and so on. It really matter how much you want to spend.
Not sure about the booster.
1986 CJ7, 4.2 w/4.0 head, TFI-HEI hybrid ignition, Clifford manifold w/Holley 390 w/cold air intake, OBA, 4.5" lift, Woody CV shaft and Tattons in front, 4.10 gears - lunchbox in front, Truetrac in the back, twin-sticked, blower upgrade for running topless, trying to keep it simple.
It's just a Jeep, and if you don't wheel it once in a while, it's not even that.