The Pertronix units are simple easy to install,reliable and easy to revert back to points on the side of the road if needed,just save the old parts.
They are THE #1 ignition upgrade in the material handling business.One of the downsides is that you don't have the advantage of the fat distributor cap if you are running a high output coil.
An MSD-6A is a worthwile addition if you have 12 volts,negative ground.
