I don't have any experience with them but GM did make newer disc brake coil sprung independent fronts with the 5/10 lug pattern on 7.25". Might be worth looking at one of those and your truck side by side and see if anything can be swapped from the newer one with disc.

•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-