Good point, Hank. If a little timing advance is good, a lot is definitely NOT better. On several dyno runs, I've observed that once the best power is reached by adjusting ignition timing, the power loss caused by one degree of over-advance is approximately equal to retarding the timing 5 degrees below the max-power point. Always err on the low side when making timing adjustments "by ear".
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!