I would say the box bracket and the steering wheel flange and bearing. Find a GM column in a wrecking yard and port the box for hydro assist. Like you said, the rest you can source. GM columns have a lot of aftermarket support and switches are quite common for headlamps, ign, wipers, etc.
They can float on you while driving, you may have to turn one way or the other to go straight. No way I would make a street driven truck full hydro. I have a manual box and a double ended cylinder on my race car. If I burn the bump or loose a line, I still have a mechanical steering system...
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