The questions, to me, are what exactly
do you perceive as performance? What are you trying to do better? Are you a good enough driver that you'll be able to tell the difference? How sensitive is your butt-o-meter is the way it sometimes gets phrased.
A complete rework of the existing engine would cost you around $18K. That would give you guaranteed/demonstrated/dyno'ed additional cubes, HP, torque and driveability. Many parts would not be original but they would all have been tested and proven together. No suspension or brakes included in that price.
It is a slippery slope.
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