The lobes on a points distributor is a reluctor, just a mechanical one. Connect Pin#24 to the points.
You can control timing with a 4-pin HEI if you ditch the 4-pin module and connect Pin#24 (like in the picture) to the pickup coil and ground the other side like in my distributor.
^^ Both these methods tell the MegaSquirt RPM and when a cylinder is at TDC.
To get spark, connect Pin#36 to the negative side of an ignition coil. If the cylinder type, just connect to the negative side terminal, if an HEI, spade connector to the Negative side terminal (left side, closest to the cap). On both coils, hook a switched 12v to the positive side. It's best if the postitive side is relayed from the Fuel Pump wire, so the coils don't stay energized with the key on, engine off. It can burn them up (much like a points distributor can).
Then follow the setting of the Trigger Angle directions to get the timing commanded to match the timing seen with the timing light. Once they match you can control ignition timing.
