Trick flow harmonic balancer

Thanks for that link, I was holding off asking until I determined if it would be needed.

My build which typically go zen like has been going off the rails a bit today mostly due to a not so smart 340 block marketplace purchase by me with issues and trying a new machine shop which left me with .0015 piston to wall clearance (tight hypereutectic), .0015 main bearing clearance, and a severe deck cut to deal with.
According to KB, .0015 is at the low end of acceptable, so I will run it that way. The main bearings I can get the .001 undersized which should get me the .0025 I wanted, and the decks will just take a fat expensive cometic head gasket to cure. Just money and time.