Balancing cast crank 340

Chuck, is that 719 grams without the wrist pins? If so than the new pistons I have would be very close. I wonder how the machine shops balance a crankshaft without having the torque converter bolted on when working with an external balance. My machinist told me he has only done internal shafts and if I came up with a way to neutralize the stator inside of the converter then we could balance mine with it bolted up.