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There's clearly something wrong with this engine well beyond it being a mix and match of parts. What surprises me the most is that you say that the car feels ok when you drive it. There is a huge drop in torque at 4000 rpm and this should be felt as a clear drop in acceleration.
According to the torque plot, the car should feel more and more reluctant to accelerate as you approach 6000 rpm. Did it feel like this when driven after the dyno test?
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