Well, once again, I worried needlessly. A simple matter of the casting being off center. All the important circles were concentric. Installed the bearings and put it on my MC tire balancer and it ran true.
The balancer instructions say if it lands in the same place 3 times add weight to the opposite side. It consistently landed in the same place every time on both discs, so I dropped them off to get balanced. Should be good to abt 120.