Thats an open ended question. How much do you want to spend, speed is money or something like that. Ok, realistically the 1 hp per cubic inch mark is pretty easy to atain and retain relibility. More costs lots of money and relibility. How much power is relative. I saw in I think Mustang and Fords a 8 second car (don't quote me on that, feeble memory) powered by a 289. It was damn fast and 289 powered though.
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