I know a guy who put a 22R in an LJ so you should be able to do it to an SJ. I think the worst parts were making the mounts, making the clutch work(toy 2wd tranny), and he used an electric fan that was sorta hard to fit(unded up using hood pins).
YOU TOUCHA MY TRUCK, I BREAKA YOUR FACE
I have an sj410 with a toyota 1.8 litre motor and toyota 5 speed tranny. Had to make new motor mounts, tranny mounts cut the front grill out, and the rad is out front behind the bush bar. I dont know enough about your motor, but if you do enough cutting and welding i'm sure it should work. Good luck
i run a 22r in my 86 sammy,toy mini truck everything no 2by stuff.used the toy rad and made my own mounts to put it where the sammy one was use an electric fan pusher and mount it in front of the rad but still behind the grill.