Welcome. From what I gather the 58.5 is the biggest size to go without boring the case. The cam is what your final desire is, more torque or more speed. A head is always a good thing to do on any performance engine. This is all relative to you doing the other items on your list too from, carb, intake, exhaust. CVT would be ideal for riding in the mountains. Also look into changing the actual gears to give you the most mechanical advantage to make the most of the power the buggy can make.
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