Anybody ever considered using those small hand held tasers for a HEI coil? Bought one for my wife, as big as a pack of smokes, something like 20k or more volts, runs off a single 9v battery, rig up an electronic switch like the hall sensor and insulate the high voltage plug wire at the connecton and I think its possible for a try, dunno about radio interference, just use shielded plug wires. I still have a set of wire braided silicone plug wires on my old truck engine, I think they were made by Mallory.