On most Briggs engines (single cyl.) the points acitivate off a plunger acitivated from a (spare) lobe on the cam. The newer blocks are often not drilled for the plunger. In all but rare cases I do not think it would be a cost effective conversion.
The magnatron units should last darn near the life of the engine, most "failures" of them are in an interlock that has hung open (or closed as the case may be). I always check this by disconnecting the kill wire from the magnatron unit and see it you gain spark (then isolate it from there).
I relize you did not ask for a troubleshooting guide, but I hoped it may be of assistance.