No Spark?

You can test a magnetic pick-up with an ohmmeter for continuity and for AC output while spinning them on the bench.
Going from memory the continuity is around 350 ohms at room temperature and I forget the AC output but Ima thinking 1 to 2 volts.
But Magnetic pick-ups are polarity sensitive too. In your engine they have to be designed for CW rotation in a SBM.