Just a general comment for late 340 and 360 engine owners: If you are not changing to internal balance, then the balance process and actual engine operation still requires the proper external weight place at the right distance from the crank centerline and the correct distance out on the snout. If the fluid damper cannot be used in the balance process, then something has to be done to put the weight in the right spot for crank balancing. (Or the balancer has to be able to figure this out without the external weight... I don't know that much about the machines to be able to say.)