This is perfect for upgrading from outdated points style distributors or when space requirements limit using the bulky HEI units. With this distributor all you need is an external coil, the 2 wires will hook up to it and youre "ready to run". An external coil with .5 - 1 Ohm is required for proper use. A high performance module is contained on the distributor itself that produces increased performance, easily outperforming stock and many other aftermarket ignitions. Includes adjustable mechanical advance which allows you to tailor the ignition curve along with a vacuum advance for improved fuel economy when used on street applications.