Yes, the 58 car had a resistor--was located on the firewall,above and right of the steering column.
Whether the distributor body turns to advance/retard spark or the point plate or breaker cam relocates, the effect will be the same.The correct pertronics unit will work just like the point system regarding ignition advance/retard.
The Pertronics COIL and point replacement I just installed on a 58 Impala was to be used WITHOUT resistor.Using the Pertronics coil makes a difference in resistor use.Read the instructions carefully.
The original coil will need a resistor in the circuit.
