IMHO it should be balanced
read up on centripetal force
before re building my "low" miles 428, there was extreme vibation within the engine as the rpms increased.
Besides a very rough rebuild with poor clearances, the rotating assembly was 60 grams out of balance.
at 4000 rpm, that equates to 40-60 lbs of out of balance rotating mass. The higher the rpm, the more mass.
It costs $150 to balance an engine's rotating assy. What doe it cost if you tear it apart.
On mine they included the flywheel and pressure plate all as part of the rotating assembly
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