Just trying to think logically here, but the longer the points are open (larger gap) the smaller the charge in the coil. So the points can control the power of the spark. The strator plates would control when, according to where the crank is, the plug sparks. This should be a specific measurement before top dead center.
Depending on how the points gap is set, it can cause the spark later, and the strator plates should be advanced to keep the spark at the correct timing with relation to the crank poosition, if you want to stay with factory specs.
Is this right, or should I get more coffee?