Would the vacuum-advance/distributor-to-block clamp provide a good ground?
It's still a moving part, and subject to grease and dirt contamination. With the housing wobbling, even the vacuum advance bracket contact can become unreliable. 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!