Why not just swap out the pertronix ignitor. Swapping back and forth requires r n r of a few screws and removig the power wire piggybacked to the 12v side of the ballast resistor and of course swapping the negative coil wire over from unit to unit.

In my opinion it is simpler to change points than replace the distributor and re'time the engine.

Sorry I do not have any feedback on the RtR units for you. They always seemed complicated for what they did.