Tim, I've got that same issue on my big 16hp briggs, believe its the same model as you're working on but I'm not leaving this chair to dig around in the barn to verify :)
What I found was the polarity of that flywheel was opposite of the magnetron units, heard tell that you could ship the FW back to briggs and they'd re-polarize-magnetize it to work with a magnetron module or coil.
I tried one of the 2 wire splice on modules like that Atom unit (napa sells one) got great spark but it was too out of time to run.
I ran a battery automotive style ignition to it. 12v coil with power from the ign switch and ground it through the points. Runs great (until the points get oil on them).
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