The GM distributor timing kit utilizes the existing distributor. The conversion kit allows for the distributor to become an accurate timing signal for the ignition system. Upgrading to the Gill ignition system now gives you increased performance and efficiency for the engine-such as start and run timing curves allowing for easy start-up, and optimized timing to produce all the power from your GM engine. It eliminates the extremely long secondary wires along with the high maintenance cap and rotor. A coil per cylinder with short secondary leads makes it a coil near plug system at an economical price , eliminates maintenance and improved performance.