Rb55,
Check out Western Chassis. They have a rack and pinion that bolts onto a 47-55 straight axle. Not sure how they do it, but it's there and it costs $699.00.
wessternchassisinc.com
Also, CPP has power steering kits if you don't want rack and pinion.
Classic perform.com

1970 Chevrolet C10
Grandpa's -- My first truck -- In progress to shiny
Follow the build in the Project Journal
1950 Chevrolet 1-Ton Dually
"Ole Red Girl"
In the Stovebolt Gallery
More pictures here
1951 GMC 9430 1 ton dually--Shiny! | 1972 Chevrolet C20- Rusty- the puzzle box lid for the C10 | 1962 AMC Rambler American- my wife's
Parts trucks-
1951 GMC 9300 | 1951-GMC 9430 | 1951- Chevrolet 1300