This forum is full of Pertronix users. If you would have done a search on "Pertronix" you would have spent half a day reading, most of it good.

Point-type ignitions have traditionally been limited by the amount of time the points can be kept closed, charging the coil. One trick Chrysler liked to use was dual points, adding a few degrees of dwell. Points also require maintenance and can be affected by physical wear from the rubbing and side thrust. Some mighty fast cars have run points, they just required more maintenance.
The Pertronix does little except remove points and condenser from your maintenance list and add dwell. Electronic ignitions in general have a higher "dwell" which keeps the coil at max charge higher in the rpm range. But unless your point-type ignition has problems you won't notice any effect from the conversion other than the placebo effect.

THE ONE THING wrong with a Pertronix conversion is that it doesn't automatically give you a high performance ignition curve. The high performance ignition curve will in nearly all cases make the engine feel like it has come alive. But unless you are like Blazin' Bob, you won't spend the time and/or dollars to recurve your stock type distributor, so you will miss out on much of the benefits you would have gained installing a new distributor with high performance curve.

So to sum it up, I have nothing against Pertronix conversions. Convert away. But before you do that, look at a reasonably priced high performance electronic distributor like the Firecore as an alternative to converting and recurving a stock distributor.

R.