I'm running Pertronix units in a 235 and a 261, both using the stock coil(no internal resistor). I did the 235 first, about five years ago and didn't use the external ballast resistor. I converted the 261 just last summer and kept the ballast resistor as a precaution against drawing too many amps through the Pertronix unit(their suggestion). I don't put many miles on either truck but so far have not had any problems with either one. From what I've heard about the high performance coils, you only need them if you are going to turn high rpm's. For the 2500 max rpm that I turn my stovebolts the HiPo coil wouldn't make any difference.
