Another Jeep. The 4.0 also fits easily into many old AMC's that had the AMC I6 as a possibility (the 4.0 really just is an advanced AMC I6). Beyond that, I'm not sure what else. I've been entertaining the thought of putting my 96's 4.0 into a Gremlin that needs an engine for the girlfriend (LOVES Gremlins), but finding a solid Gremlin is pretty hard.
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My 96 XJ is for sale in the event you want something to restore or build into a wheeling rig. Sale ad is HERE