If your drums are good reliningyour original would be simplest and most cost effective.

If your drums are not good again look at swapping newer DRUM brakes from a 14 bolt.
You could swap disc... but that's more trouble because you then need to swap master cylinder and install front 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-