If he's getting 9.6 volts at the coil on a 6V system with the engine running, he's got some serious charging system problems as well as ignition trouble. I'm betting a 62 GMC has a 12 volt electrical 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!