A few months back I tried to convert my small block dual point to a Pertronix with no luck. I bought two different units, but in both cases the mounting holes did not align up with the threaded holes in the breaker plate. The first one I ordered from Summit was based on the listed application. When that one did not work I called Pertronix. They told me to return it for the correct one part number which they provided. Only to find out that the next one also had mounting issues. I called Pertronix again and they told me that I would now have to modify the unit to make it fit. I have had enough at that point and just returned the unit for a refund.