The ultimate HEI Kit has everything you need to make your early model GM HEI Distributor a great performance distributor. The MSD HEI Module features special circuitry that produces 50% higher coil drive currents than n a stock module resulting in higher spark energy at racing rpm. By matching the Coil specifications with the module, MSD also delivers more accurate timing and dwell control. To ensure all of this new power makes it to the plugs, the kit is supplied with high quality rotor and a durable cap with brass terminals for superior conductivity. Even a new dust cover to top it all off is supplied.