The Pertronix system replaces the mechanical points with an electronic trigger unit that does not wear or burn like points do. Some people have had reliability problems with the system, with unexpected failures to operate that shuts the engine down with no warning. It's a good idea to keep a set of points and a condenser in the glove box to install in case of a sudden stop.
My nephew's Plymouth Roadrunner 383 engine has that system, and my only gripe about it is the fact the reluctor that installs under the rotor is a little sloppy. That makes the ignition timing inaccurate by whatever amount it is able to move back and forth. It would be a pretty simple fix to just glue the reluctor the the rotor, I guess, or use a piece of shim stock to take up the slack.
Any bushing wear or looseness where the distributor shaft fits the housing will also allow timing errors, so start with a wear-free distributor, or a rebuilt unit.
Jerry
