It is one of MSDs solutions to the GM HEIs common problem of power loss and lack of response or bypass the low-powered HEI module and coil and replace them with the MSD Digital 6AL Ign Control and the Blaster 2 high input coil. The result is more power, increased rpm range, easier starting, plus better mileage and performance. The Kit includes the new MSD Digital 6AL Ignition, Blaster SS Coil, coil wire, and HEI dust cover. The 6AL has a Soft Touch Rev Control to protect your engine from overrev damage.