The 4BT Cummins fits a lot easier in an AD truck than the very long 6 cylinder Cummins.

As for the indirect injection V8 fords, they're nothing special these days, may not be as nice a swap as something a little more modern.
Not sure on the size and actually fitting one... I bet it's very tight. The front axle will be very well loaded, perhaps overloaded.

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-