McCleod sells a B.B. flywheel that can be internal or externally balanced. They provide weights you can add to create the imbalance to the opposite side where the factory just drilled out material to create the same inbalnce.
SST (Silver Sport Transmission) also has a SFI approved 130 tooth flywheel 10.5/11.0 pressure plate patterns, neutral balance, but comes with a bolt on weight for the cast 440 crank...I'm running one behind my cast crank 440 for the last decade+....zero issues
