With the original frontend, you could try locating a 53-54 power steering setup. The show up on ebay from time to time. You will need the column, the bracket that mounts it to the frame, and the pitman arm.
Otherwise, Jamco supposedly has come out with a PS setup for the 49-54 cars, but I don't personnally know anything about it.
I was thinking about looking into the possibility of adapting the steering from a 41-48 car. If possible, then using a "normal" box could be done. It would be similar to what Buffalo offers for a steering update on the 41-48 cars.