Ed, do you know if the cab and radiator are set up on the GMC's with more clearance for different engines? I don't know the dimensions of a Cummins or Detroit inline but I do know that the V8 in my Chevy LCF is pretty close to the radiator and doghouse. I was just cautioning Steve89 to be aware of the confines. I'm happy with mine now with the new 2 speed differential, SM420, 10R/22.5 drive tires, it can stay at 60-62 mph at 3800-4000 rpm.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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