Haven't had this problem in any pertronix I installed, My suggestion would be to inspect the distributor before installing it, why would anyone put a worn distributor in their car is a mystery to me.
Under normal conditions (good distributor) pertronix works fine.
http://www.kingofgtos.com/index.htm
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http://www.stockappearingdrags.com
http://www.stockappearingdrags.com
Come on get off that lawn chair and drive that car like it was meant to be driven.
69' 400 RAIV Judge Conv... 12.86@107 Factory Stock
69' 400 RAIV Trans AM .....12.48@110 Factory Stock
69' 400 RAIV Judge HT..... 13.07@104 Factory Stock
73' 455 SD Trans AM........13's?? not run yet
66' 455 GTO Convert.........12.20@112 non original
63' 421 SD Catalina...........restored fast as h*ll