Don't merely disconnect the plug wire. Make sure the spark is grounded or the spark voltage goes sky-high, and that's really hard on the ignition coil, and all the insulation in the ignition system secondary circuit.The next time the engine is stone cold, before starting it, temporarily remove the #1 spark plug wire...
...Don't run the engine more than absolutely necessary to prove to yourself that the sound has/has not been affected.
A jumper-wire from the spark plug end of the plug wire, to ground would be fine. Alternately, poke a small, blunted, greased finishing nail BETWEEN the plug wire and the distributor cap boot, until the nail touches the metal plug-wire terminal. Then ground the nail with the jumper wire. DON'T puncture the insulation.
Photo shows all eight, you'd only need one.
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