To change from the 40B to 11A you have to change the shaft, weights and the breaker plate. To me the advantage of using the 37-48 points is the best advantage of the conversion. The better advance curve helps but is not as drastic as people think.
I made up a spare dist with the 11A shaft and the small points,installed it awhile back,
I couldn’t see any difference at the time,maybe install one then the other,might be able to feel the difference,,
