ACCEL 8200 High-Performance GM HEI Distributor Tune-up Kit High output 4-pin control Module. Advance curve kit to dial in your HEI. Easy to use battery/tach pigtail. Fully adjustable vacuum advance. Includes all hardware needed. Performance coil produces 50,000 volts High quality cap and rotor with brass contacts 9 performance items to upgrade you HEI distributor