General Motors (GM) HEI electronic Ignition module is small and readily available. It allows for an ultra-high energy module conversion. It is typically used with a Pertronix points-replacement conversion kit. Think of it as a high-power relay for low-energy ignition sensors.
AC/Delco HEI module $31 Rockauto
Wiring Diagram for reluctance-type electronic distributor
Wiring with the Datsun wire colors (example: D4F "Remote Ignitor")
Multi-spark module with adjustable rev-limiter $80 (Pertronix HEI III)
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