That method is terribly messy and inaccurate, too. It's much simpler to do the adjustment with the engine stopped. Just be sure the cylinder you're adjusting is on top dead center with both valves closed. Either use the distributor rotor to indicate which cylinder is ready to fire, (top of the compression stroke, both valves closed), or use the "companion cylinder" method I've described several times. You couldn't bribe me to do a running adjustment on a hydraulic-lifter engine!
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!