I'd replace them with rubber bushings. The poly bushings will make your Jeep a bit stiffer.
I did the bushings on my 85 CJ7, and while it's not really hard, each bolt was rusted through, so you'll definitely need all new quality bolts.
You spend a couple of days squirting penetrating lube on the bolts, then you unbolt all the body mounts on one side jack up the Jeep and replace them, then move over the other side. It will take you an afternoon probably