What is failing about the plugs? There is no reason I can imagine for the HEI system to damage plugs- - - -having that 50KV+ open circuit voltage available will fire a plug with the ground electrode completely removed if necessary, and if the plug is clean and gapped properly, the firing voltage is usually below 10 KV, regardless of what ignition system is used. Gap the plugs at .035"-.045" when using the HEI system.
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!