What coil are you using? If it is a true 12v coil, it doesn't need a resistor.
If there is a part number on the coil, look up the specs and see if it needs a resistor. Only if you are using a 6v coil or the coil says it needs a resistor should a resistor be used. You can also check the resistance across the primary terminals out of circuit. A 12v coil will have around 3 ohms resistance, no resistor needed with that one. A 6v coil will have about 1.5 ohms, that will need a 1.5 ohm resistor to work properly.
To test the voltage at the coil, with the ignition on, temporarily ground the - terminal of the coil. Check the voltage to ground at the + terminal. Without a resistor it should have near battery voltage. With a resistor, it should have about 6 to 8 volts. Do your test quickly so not to overheat the coil!
If you have a test light, connect it to the - terminal of the coil and ground. Spin the engine, the light should flash, the coil should spark. Light always off, the Pertronox or wiring is shorted to ground, the coil is open internally, or no power to the coil. If light is always on the Pertronix is bad, the wire between the coil and distributor is open, or the distributor plate or housing has lost it's ground.
Where have you lost spark? At the coil tower or at the plugs? If there is spark at coil, the Pertronix and coil are good. If spark at the coil but not at the plugs, there is a problem with the cap or rotor, or possibly something is assembled wrong with the Pertoronix causing the coil to fire when the rotor is not aligned with the cap terminals.
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