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The stroker motor - assuming the same heads and cam - will make more power everywhere below its power peak.
That power peak will be at a lower RPM by - this is a VERY CRUDE estimate - 10 RPM/cube. In other words adding the 3.98 stroke's 25 cubes will pull the peak point down by 250 RPM. Your heads will become a restriction sooner in the RPM range - but on an FE they are already likely to be a restriction...
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