I would say save your hair and stay with the manual steering. If the original steering box is rebuilt or in good condition you should be good to go. The 5.0 Mustang engine is about the same weight as the original panel truck engine. Having the upgraded brakes is plus.

 

Been out half the day pulling hair, and banging my head...lol Have the unit temp mocked up with C clamps ect, I just may have to go another route..
Seems problem one is the leaf springs are alot lower than the unit, would take
a substantial bend in the tie rod bars near the attach point on the unit. Second problem are I would have to make two diff length tie rod bars for the offset since unit is for a 31" frame, and the truck is 27". Third problem the spindals kick the tie rod in about 1.5/2" away from the unit, this may get compensated for with the pitman swinging in, and out on the movable part of the unit. Havn't given up, just had to walk away for a min.

 

Ok, update is have worked with a mock up unit again today, will have to shorten power drag link at least 2 inches, and build a 1/2 inch bracket/spacer for the ram, this will put both tie rods at 24", will still need tie rods to bend with a brace at bends for flexing, but also it seems the power head part may stick to far to driver side, and the tire rub at full turn. not quite ready to give up, but am starting to weigh other options...

 

Ok, it's official, after 3 daze of trying different ways to see if the Hydro assist can be put on the 47 it will not work. Somewhere, or someway something is in the way or binding...On to next idea...