I am in the process of rebuilding my '53 Chevy pickup which is identical to yours. I am using the stock front axle and converting to power brakes and power steering. For the steering, I am using a GM tilt column that I am adapting to the stock dash. There is a Borgeson coupling on the bottom of the column which connects directly to a mid-80s Toyota Land Cruiser power steering box which is very similar in size and shape to the stock Chevy. Made a mounting pedestal that bolts the unit to the frame. I used the GM donor car under-dash steering column bracket which serves dual duty since it also has the power brake pedal and holes for the studs that penetrate the firewall and mount the power brake unit. I am using a Toyota modular power steering pump with the reservoir built on. Needed to make a bracket for that to. Got a dual groove crank pulley from Jim Carter's pickup parts to handle the second belt to the pump.
Cost is very minimal since the parts are all junk yard refugees except for the crank pulley.
Here is a photo of the underdash installation. Column and bracket are similar for all GM passenger cars made it the 70s and 80s.