The Super HEI Kit-which is a smog-legal modification, by the way-allows you to retain an already installed HEI distributor. Depending on the type of module you're running (four-, five-, or seven ...

Originally, the HEI system was fitted with a four-pin module. By 1978, it had a five-pin unit. Seven and eight-pin modules were more a computer-controlled element that came around in the 1980s.

With the electronic HEI module mounted inside, and the coil in the cap, the Davis distributor needs no external extras to work. Just a hot 12V wire in, and it's ready to run.