On a real HEI, just ground the "tach" terminal, the one right beside the main power wire that goes to the distributor cap. Grounding a phony system like a Pertronix will probably kill it, too, but it probably won't ever start again.
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!