CPP Power Steering unit. Looks very similar to the 53' Lincoln PS unit.
https://www.ebay.com/itm/1953-56-For...-/283480584172
Kit also includes the correct power steering hose kit to hook the gear box to your power steering pump. The rag joint is designed to work with your factory column, making it a breeze to install. The pitman arm is designed to work with your factory steering parts.
Flathead Pump:
https://i.ebayimg.com/images/g/nvsAA...aBS/s-l640.jpg
All you will need to find, is the 3 belt pulley for the crank shaft, unless this will work with a longer belt over the generator or water pumps, then you could use the 2 belt pulley, you already have on the truck.