X2 I dearly hope you are not using those sprockets or chain. Do NOT use a plastic sprocket.
The bottom sprocket has a dot on a tooth. The top sprocket has the mark BETWEEN two teeth. So the bottom sprocket with the marked tooth points exactly between the two top ones with the mark.
This by the way puts no6 ready to fire, and not no1. After lining up the marks, but before you put the distributor in, rotate the crank one turn.