NXSLT1

I have a spec clutch and billet flywheel on the way to go on a stock bolt on only motor. From I what I understand the LT1 is externally balanced on the flywheel. I've done many a flywheel swap on SBC without balancing and had no problem so does it really matter as long as the flywheel is zero balanced?? And is the spec flywheel zero balanced??

What I'm saying is I aint pullin out the motor and tearing it apart just to balance the flywheel, does it really matter?