The whole setup is axisymmetric. The only way it becomes unbalanced is if the bolts weigh different amounts. Weigh them and grind off material to match them if you wish, but nobody does that for the clutch/flywheel or the oem damper bolts, it's all commercial hardware.
For an engine with this much power I highly doubt it makes a noticeable difference. You could barely tell on the little Honda motors with a lightweight underdrive pulley.
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