There are warnings against using plain wire core wires on Pertronix and Mallory electronic distributors. They recommend the coil type wire to choke down the current flow. There are several reports of Pertronix early failures caused by using solid wire.
Another issue is susceptibility to moisture intrusion. I started with the MOROSO OE64011 universal cable set from Speedway. Left the car outside on a rainy night, and the next day the car would not start, until the wires dried out. Switched to the more expensive PerTronix Flame-Thrower 7mm Stock Look Spark Plug Wire Sets 708190 from Summit, and no further problems with starting on wet days.