RB,
What you fail to understand is that when you put that big cam in an engine & it runs rough at idle, the engine is misfiring. Even stock engines misfire but you do not notice/hear it. If you can reduce or eliminate misfiring, you make more power.
At idle & low speeds, a long duration spark is needed with a lot of heat in it. Inductive ign provides a long duration spark, ideal for the purpose. This is why modern engines use high energy systems with big plug gaps to run leaner mixtures & reduce emissions.
Try running points ign & 0.025" plug gaps on one of these engines....
From the Bosch Automotive Handbook: ' An ign spark energy of approx 0.2mj is adequate to ignite a stoichometric A/F mixture, while richer or leaner mixtures require substantially higher levels of spark energy'........'On the one hand, the electrode gap should be as wide as possible so that the spark reaches as large an air-fuel volume as possible & the mixture is rapidly & reliably ignited so that the engine runs smoothly'. ..........'It is frequently impossible to achieve smooth idle when the electrode gap is too narrow'.
Phil Jacobs, founder of Jacobs Ign Systems, claims 0.100" is the ideal spark plug gap.....
