For cost effective mods the gearing is right up there. EFI is a good idea if your carbs need to be replaced as it is expensive, but it does allow some easy tuning and is probably fun to play with. You will not save enough fuel to get your money back, that's for sure.
For sure, significant aerodynamic improvements are tops in return on investment when paired with tall gearing.
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Good design is simple. Getting there isn't.
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