Advice on 91 XJ

Nice. What does she look like? 2 door 4 door? I would go with the normal tj fluids that should be changed being they are the same motor. Fold that back seat down and bring an air mattress should be comfy.
One thing regarding the fluids, the manual calls for "power steering fluid" so I would stay away from ATF-4. Some say it doesn't matter but others go nuts at the suggestion. I run PSF in mine.