A 235 is modern compared to some engines.
They run good, last a long time, and are cheap.
Even a direct bolt in for your truck.
What do you think?
Grigg

On another note, think about a Cummings 4 or 6 cylinder, the 4 fits nicely. Good fuel economy and power, dependable too

•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-