The statement was "Dyna requires 3 Ohm or higher resistance coils. The BS350 coils are roughly 5 Ohms, so they should be fine." Just to be clear, the 5 ohm coils are OK without any added resistance, although some added resistance would cut down on coil heat and current draw if the spark wasn't adversely affected.
That's a nice clean conversion on your Bridgestone, billdok.