Balance? Not an issue. The magnet weight is a very close match to the metal drilled out. And remember the cam is at half crank RPM.

BTW: Regardless of the ECU you have a fairly wide window for the signal to occur (+/- 30 degrees). It's only telling the ECU when to start the sequence. It has no effect on ignition timing. So the cam sensor does not have to be adjustable. Just take the time to position the sensor in the middle of the acceptable range and bolt it in. A little off either way will not matter.

As to Andy... The /6 market is pretty small. When I wrote that "Leaning Overkill" EFI article there was a lot of curiosity but not that much business. This is yours truly checking injector sequencing on that motor.