My old dist had worn bushings and the shaft had a lot of movement, so the points didn't stay set. I bought a new/ reman dist from carquest and had the pertronix installed by a high performance ignition shop in the new dist. I've been driving the truck 6yrs and have not had any problems. You can purchase a round coil from pertronix that is the correct rating for the pertronix ignition.
Sometimes I wonder if the correct coils are not installed that is why some people have the failure problems? I have a few friends that have pertronix in small block chevy's and other makes of cars with no problems.

Tommy
59 apache 1/2t
261 short stepside