Most Lucas AAU units are completely worn out now, and like Amal carbs werent that great even when new! It might be worth looking at old Honda twin AAU units, which might be possible to modify? One of these in conjunction with an electronic box which uses the points simply as a trigger, and means burning and sparking is eliminated completely, should result in a very good system, which is likely to work better than most electronic ones, and can be easily repaired if needs be.