That CPP kit is quite neat. It doesn't disturb the steering box or column. The control valve is on the new drag link and the power piston is attached to the new tie rod assembly. I don't want power steering myself but if I did, I would used that kit.
Someone sent me a really nice bunch of photos of pickup trucks loaded on transport carriers in the 50s. One of them is an AD cab over. there was no power steering on thast rig.