[MikeK]

Adding a potentiometer (throttle position sensor) to a carburetor will be of little value without extensive mapping of a specific engine build because it would not be independent of fuel metering/lambda/lean/rich.

What is really needed is a MAP sensor input so you could have a selection of vacuum advance/retard profiles over selectable RPM advance tables. (A generic MAP sensor is about $25) That would give you excellent economy cruise and quickly compensate for variable engine load while accelerating, going uphill, etc.

Missing from all the points replacement systems and modules for older Kettering ignition vehicles is a time-out system to prevent current drain if the engine is stopped with the dizzy cam sensor in the old 'points closed' position. Not only does this prevent the coil from cooking due to 100% dwell saturation time, it keeps your output switching MOSFET from getting smoking hot on its heat sink and possibly failing. Easy to do- output gate clamped via a simple timer until the cam sensor delivers pulses less than a few seconds apart.