I used an IH scout II steering box in my 52.
Will probably work for yours too. It bolts to the outside of the frame.
Check the pictures on my link below for the Chevy axle conversion.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-