The Pertronix conversion should have nothing to do with the cranking speed as you attempt to start your engine. If the initial timing is set too high then that might affect cranking speed. Most HEI's run full battery voltage. Points go through a ballast resistor that limits running voltage to about 9 volts. Your primary ignition feed should come from a "key on" source such as an unused accessory terminal in the fuse block. Don't run a wire from a source that is "hot" when the key is removed. If you run the stock wire to the distributor you will limit the output voltage due to the reduced feed voltage, but this will not affect how the car turns over (cranks).
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