GM control module

I used a "factory" coil on 3 different projects.......my 67 when it was running, the Cletrac/ Toyota 20R swap project, and one other of a friend. All had older "can" ballasted coils, The HEI has a sort of built in current control and using them does not seem to hurt a thing. Even with the old style coils HEI makes a LOT more spark

Also, an HEI module, as apposed to factory Ford, the old Jeep / Prestolite or Motorola/ factory Mopar, or Pertronix, DOES NOT draw coil current if you end up with key on/ engine stopped. No danger of burning up anything