Correct internal or external coil for pertronix points eliminater

Just had another look at the Pert site. Says 'delivers twice the voltage to the spark plugs'.

Another dubious claim is that their high end module that fits INSIDE the dist & multi sparks right through the rpm range. This would be a huge selling feature if true & one would expect the competition to pull one apart & copy it; hasn't happened that I am aware of. My understanding is that only CD ign can multi spark to high rpms on an 8 cyl engine; this system requires a large capacitor & transformer & would not fit inside said module.