The HEI distributor is an inductive-discharge-style ignition, but with the points replaced by a solid-state switching device called an electronic ignition-control module.

The HEI’s integrated ignition coil in the distributor cap makes it the most compact ignition system in history. No external ignition coil to sweat out.

Here's the drill. If you have an AMC, a Ford, or a Chrysler distributor with a magnetic pickup, it's really easy to convert to a standard four-pin GM HEI module.

The GM HEI distributor is still a marvel of simplicity and reliability after four decades. Here’s how to maximize its performance on the cheap.