Ford nine inch cut down front and rear, or Danna 44 front and 60 rear. Cut to the length you want. Coil or leaf option can be added when you make or have the diffs made.
I have T18 for sale!!! You'll need a bellhousing adapter as it was behind a chrysler, but otherwise, granny low and 4 speed, beefy and best thing, it's short!
Dana20 box might not be the best choice behind that sort of HP.
What size tyres you planning to run ??
IMHO 6-8" Suspenion is massive on a std CJ5 WB....and I don't mean in a desirable way.
My suggestion would be start by planning the build around the driveline & tyres - then decide how much WB and lift will be needed to suit.
Also the intended function makes a big difference too.
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