Use of a VOM will prove you are wrong about the stock system. Instead of repeating what you heard at the trailer park, why not see what it actually is?
The Pertronix unit wants 12 volts to the switching unit. You can easily wire it that way per the Pertronix instructions. It also works fine on anything above 6 volts. So for example in my GT-E it has been working since 1994 perfectly running off the resistor wire. The distributor wire from the Pertronix unit fires the MSD 6AL in my car. So the coil (an Accel oil filled one) gets 35+ volts at about 3 amps. None of this voltage goes through the Pertronix unit. Literally ignition you could weld with. My tach runs using the “Current type” MSD tach adapter wired per the instructions.
The Mallory Unilite module is quite fragile. I would put a Chrysler 1 1/2 ohm resistor(low side of the dual resistor) in line with the stock wire. Volts at the Mallory Unilite will be about 7 - 8 volts with the engine running.
If you have not purchased the Mallory Unilite yet, don’t. A Ford Duraspark or MSD distributor is far more durable and accurate. Add an MSD box and it is a very powerful and reliable system.