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What sort of off road racing is it? Will it involve sustained periods at full throttle, or will you be using the entire band of revs?
If you are at full throttle, then you's want most of your power to come at high rpm. For this, you will want big duration cams. But offroad (wheelspin), I would think an imposed rpm limit would be useful to help prolong the life of your engine.
If you are modulating the throttle, go for some smaller cams. The ones you suggest are possibly ideal. This will spread the powerband over a larger range.
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