No guarantees on a Pertronix- - - - -those things go belly-up if "The moon is in the seventh house and Jupiter aligns with Mars"- - - -but an easy, no damage way to disable a HEI is to ground the "tach" terminal on the distributor cap. That used to be one of the diagnostic tricks I used on my students when I was judging high school skills competitions.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!