You shouldn't HAVE to go to cross over with your lift, but I woud highly suggest it. I broke my stock j-arm steering at the Round Up last year and was extremely lucky my buddy had brought his old one for me as a back up. I just installed crossover on mine, but haven't had a chance to drive it or wheel it. I considered finding a non-power steering steering box, but decided I would want to convert to power steering at some point down the line anyway, so I did it now. I needed to purchase an IFS box anyway. . . It is possible to run a power steering box without the pump. Just fill it with fluid and connect the hoses back to themselves. That way it has fluid. And you'll have the option of adding the pump later. I'm glad I did!! The little I've moved it arround so far, its been really nice to have!!!!! : ) It was a really Bear to turn my 33x12.50s while stopped without it. Especially when air down. And the lincoln locked rear diff didn't help any either. lol
Good Luck and keep us posted as to what you decide.
You are running a dropped drag link though aren't you?