I just heard back from Barry. Just for anyone who is doing this in the future, Barry says that the amplifier is unneeded, so just run the wires to the coil as in the instructions.
I ended up trying it this way, but the rotor started rubbing on the bracket on the other side (although at the top, vs on the bottom earlier). I don't think this is a run out issue because the rotor doesn't wobble when I spin it (just eyeball on the gap in the bracket).
Somehow the bracket is tweaked. I took a flapwheel to the lower mounting surface of the bracket, and took maybe 1/2 mm off and that fixed my issue.
I checked and rechecked that everything was sitting flush since it seemed pretty extreme to remove material, but everything sits right now and the gap between the rotor and the bracket is pretty even at the top and bottom now.
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DrieStone's post in Keep the Lucas AB14 Amplifier if I'm running the 123Ignition? was marked as the answer