American powertrain used to offer steel flywheels with the notches. I don't think they offered them in a 5.9L balance, but most flywheel joints can do that. It is NOT the same balance factor as a 360.
Funny. I went round and round with a guy from Modern Driveline about this. They show (showed?) a flywheel part number MD-LBS360LA-130T that the guy swore was right, but I was never really sure. They do show a flywheel for the 5.9 with notches though, but the balance listed doesn't match the 5.9 (I don't think).