Sounds like you can just find a stock truck then, with a strong V8 and brakes in good shape, possibly a front disc conversion and you're ready to go. For what you describe you may be able to get away without an OD transmission, just gear the rear axle to suit. Or an NV4500 may be a good OD swap?

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-