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Someone else recently posted a link to that 347. it says as cast aluminum heads, 10 to 1 compression ratio and a hydraulic cam. It does not say the brand of the heads. It would be very difficult if not impossible to get that horsepower with those parts. You should check with a engine builder to see if they think it is possible. If you can get the brand of cylinder heads you can make a better guess. With ported heads if done right it's possible. Power adders like superchargers or turbo's are always cheaper if your current engine will stand up to them.
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