There are lots of threads here on Power Steering, and there might even be a Tech Tip in the TechTip area.
Basically you've got a couple of things to figure out with the 235 to put powersteering in:
First, the power steering box and hooking it up to your steering column. The stock box the 47-55 trucks was an integral part of the steering column unlike the modern set ups that use borgensen joints and a shaft to connect the column to the box. So, you are going to have to decide if you want to keep your stock column. To do so you'll need to cut off the old box, put a bearing in the mast housing to keep the rod centered and then get the borgensen joints and a shaft to run between your power box and the column. The other option is to buy a used modern column from the junk yard or a 'flaming river' or other aftermarket column (expensive).
Next you need a power steering box. I have not seen one that mounts in the stock 47-55 location, which is ontop of the frame. What most people do is buy a kit to mount a later box on the outside of the frame rail where your driverside shock mounts. Then they move the shock mount closer to the cab on the frame. To make that work you also need a new steering arm, which is the arm at the other end of the drag link on your existing set up. The steering arm bolts to the wheel assembly. After that you'll need a new pitman arm and drag link. There are kits that have these parts. There are also kits with the box and parts.
FINALLY, you'll have to figure out how to mount the powersteering pump. That's what Bigbadwingdaddy was talking about. In the 50's some chevy cars had generators had the p/s pump mounted to the back of them. If you can't find one of those and don't have a/c you can mount it on the driver's side of the block pretty easily. If you've got A/C and an Alternator or Generator It's gonna be trickey to mount a power steering pump on the passanger side of the block. I have not seen one done on a 235.
Hope this was more helpful than remedial!
