Slant 6 Dual Point Distributor Conversion.

Yeh the simple story is they must overlap when both or open. The reason you cannot just simply close down a single point to increase dwell is at least two fold. One is that when you close down a single to increase dwell, with less gap, they simply become more critical, and don't have to wear very far to "wear closed."

The other issue is that when you close down a single point in that matter, they don't open as quick, and the points tend to burn worse