My 48 is a dually, and somewhat custom, has newer engine, transmission, axles, disc brakes, and PS.
I started with the original frame and body and went form there.

I don't care much for a whole frame swap, as the front fenders don't fit over the wheels on the newer wider frames/axles. But really you just want a new truck complete as is but with an old body, if tires that don't fit the fenders are OK with you than a cab swap may be what you need??

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-