I have decided to use Oertonix in my 1969 Z28. All original cars. You MUST apply 12V switchable ignition voltage to the coil or the Pertonix will drop if under voltage is above 4000 RPM. You MUST use this spool as well. If you try to use the original spool! The g value in ohms is too high. Again. Pertrox fails at around 5000 rpm. This solved all my problems.
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