In the FMJ, .020" point gap automatically provides an .15" edge gap along with the called-for dwell angle, asssuming the moving parts aren't worn badly. If they are, he's got more to worry about then just breaker and edge gap. Impuluse working and timing? Bearings? State of magnet charge?
The idea of maximizing spark potential by edge gap instead of breaker opening/dwell angle . . . falls into the category of adjusting valve lash by valve timing degrees instead of measured clearance. Works for racing puposes but usually has little meaning for someone screwing around with a tractor. Even with racing, threre have been long arguments, some even written by Henry Ford.
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