EFI install on my 360

A stock electronic distributor can be modified by locking the advance plate, drilling and tapping 3, 6-32 threads for allen screw to lock the reluctor top hat. The screws need to be set to avoid run out. Where the advance plate is set adjusts trigger phase for rotor.

The reluctors are made of powdered iron, they can be demagnetized, else variations in cylinder timings. It takes bench work with a scope, timing light, variable speed motor to turn shaft. Use VR signal and trigger signal, storage scope or logic analyser. From that, check rotor phase, and timing cylinder to cylinder, tweek things to make it right. Really, not worth the time it takes. I totally agree with Mad Dart.

The Mallory Uni-Lite rotor with optical shutter can be modified and used with an optical vane sensor that is rated for automotive temperature. They work better than VR sensing. They are zero speed so it is easy to make static timing checks. I modify the shutter to make use of two timing edges, one is base time, the other max advance. For me it is easier to write code for advance, and less micro controller overhead, than multi tooth gear sensing. I control timing and fuel for each combustion event, including predictions based on rate of change.

On 2.2L Mopar 4 with turbo Hall distributors, a metal shutter wheel is used. One shutter tab has a window for sync. I use that for direct fire ignition and sequential ignition. The V8 magnum engine with 1/2 circle shutter Hall distributor, could be used if a new trigger wheel is fabricated..... I have not done that yet, but would be my plan if I ever plan to sell a Mopar engine management system with coil on plug ignition.