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The good thing about a 400 BC is you will not get much more speed but what speed you get you can hold up a hill. My friend has one in his M816 and has not had any problems. He does take it easy but that beast will hold on most any hill without a drop in gears.

I would think if you are very mechanical just drop in a 400 big cam Cummins, anything else I think will disapoint you.