On my engine, I am not sure what the numbers were as far as balance, but I know the machinist is very particular and gets it very close. I am running only a pulley because I just did not care. I cant say I would recommend it. In fact, for my turbo motor I had a custom ATI pulley/balancer made. It uses a serpentine belt and has the TEC pickup wheel built in. A very nice part. I actually think I have just been lucky so far and it is just a matter of time.
On the stock bottom end, when I first put on the modified head and fuel injection, you could feel the vibrations starting at 7000. Guess what happened? at the auto cross the engine went boom. I brought it home and realized the flywheel should not turn independently of the front pulley. Yes, snapped the crank at the last rod. I think part of the broken crank is on the counter at Motorsport auto. So , the new bottom end all balanced out has a totally different feel and no vibration.