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That looks like a cool rig. This forum is geared towards the new (2022+) Wagoneer and Grand Wagoneer. You may find some info, however, at https://www.fsjnetwork.com/forum/. Maybe check out this thread as a starting point: https://www.fsjnetwork.com/forum/viewtopic.php?t=4451. I'm into IH Scouts, and have seen some gnarly things done to those. I imagine power steering can be added to your FSJ - just may take some searching for parts and ingenuity.