ATI super damper?

As has been mentioned, if the replacement pistons are any kind of “performance” piston, they would be lighter enough than stock to warrant getting the crank balanced.
With external balanced rotating assemblies, the damper and flywheel need to be installed during the balancing process.

What I did to make up some external balance flywheels to use on the dyno was to duplicate the amount of imbalance from a B&M weighted flexplate onto a std zero balance flywheel.

So, if your flywheel is zero balance, that’s one way to get you “closer” to being correct(have it matched to the correct B&M flexplate).

There are also some old drilling diagrams in the MP manuals that tell you where to drill a std flywheel for use with an external balance crank.