The problem with points at high speed is that its takes too much time for the points to mechanically open and close again. Inertia of the moving parts is most of the problem. They tend to 'bounce' and not be where you want them to be at high RPM. As RPM goes up there is obviously less time for the points to be closed and if bounce then decrease that even further you have a problem. When dwell gets low enough the coil output goes down and reduces spark energy. The amount of time the points are open is pretty much meaningless as long as they stay closed long enough (dwell) and open at the correct time.
The Ford dual point system uses one set of points to 'make' the coil circuit and another set to 'break' the same circuit. So each set of points has more time to perform its function. The result is dwell does not decrease as badly at high RPM.
You can use the dual point system on other engines but at lower RPMs there is no advantage. Unless you run 6-7000 RPM you may not see any difference at all. | 
