The MSD HEI Distributor Kit allows you to get rid of your bulky GM HEI distributor (large cap with internal coil) and bolt in some true MSD performance in a smaller package. The Ready-to Run distributor features a built-in spark energy intensifier which provides a much more powerful spark than the stock HEI. MSD's race proven mechanical advance allows you to tune in an ignition curve while a vacuum advance provides street economy. An MSD Blaster SS Coil tops off the system to deliver the high voltage sparks to the distributor.