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The only thing that is "waste of money" on that spec is CIS. I strongly recommend you to do the twin-plugging. It will give you bigger margins when adjusting ignition timing and allow you to get better mean cylinder pressure thus more power.
Forget reving to 8k...there is nothing there with C2 cams, certainly not when using CIS. It will choke the engine long before.
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Thank you for your time,
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