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In that case it’s very simple. Connect it to the factory coil + wire. That wire will be “hot” in run and crank. It really doesn’t get any less invasive into the factory wiring harness or easier than that.

If your looking for switched 12v power to use as a “run” signal, the coil + wire would do the trick without any cutting of the factory wiring. The coil should be powered from the Mallory ignition box. So the factory wiring would need to be removed from the coil. That is how my MSD box is set up...

Check for power at coil while the engine is cranking and the key is in start position. We ran into this issue recently, had a issue with the connection at bottom of steering column. Hope this helps