I just took a scope picture of one full cycle of ignition timing, and the result showed that the engine, cranked by the starter, (sparkplug removed) rotates at 5.868Hz (cycles per second) corresponding to 352 RPM.

Looking closer at the previous closeup of the timing peaks reveals that there is more like 16 mS between the peaks.

Calculating like before. I get the first peak to arrive 34deg before the other. If that last one is positioned 3 deg. before TDC as Mike has shown in his ignition curve thread, then it means that a stock system can time from 37deg. before TDC.
But it would not be difficult to mount small neodynium magnets exactly where they are desired to be, to place the trigger pulses at appropriate timing points.