Also consider this disc swap keeping old axle beam. Might allow more room for engine than IFS does.
https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1135069/Disc_brakes_for__3/4,_1,_1.5,_.html#Post1135069

•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-