If you go to (-) ground (with the appropriate alternator and EI unit) for the most effective spark, connect the power wire from the ignition switch to the (+) terminal on the ignition coil.
If going to EI (likely Pertronix) be sure to use a coil with the appropriate primary resistance OR add a ballast resistor as needed.
Follow EI manufacturer's instructions as to what the minimum primary resistance their unit will tolerate.
LOW coil primary resistance GENERALLY = HOTTER spark AND more primary current and (HEATING) of the EI unit and there are limits of what they will tolerate.
Be especially careful not to leave the ignition switch on without the engine running or you may let all the smoke out of the EI unit and possibly the coil.
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