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I think you'd be better off running a cat 3114. Basically same, but 2 cyl cut off.
Although, food for thought....
http://www.trucktrend.com/features/1601-this-1993-gmc-3500hd-is-a-trailer-towing-king-with-7-2l-caterpillar-engine-swap/
I dont think a at545 would hold the power much more than a...