I wouldn't add any "upgrades" to the engine, as well, all of them take a hit on rideability, reliability and/or durability. Nothing beats CV carbs for smoothness and MPGs, cams also end up moving the powerband higher and losing low end and smoothness, and big bore kits are also known to decrease durability due to the extra heat. Maybe suspension, exhaust or brakes.
Well, if I were facing an engine rebuild, I would also look into having the engine blueprinted/balanced, for increased smoothness and reliability, the extra wee bit of performance would be a bonus.
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Go soothingly on the greasy mud, for therein lies the skid demon
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