Use the positive piston stop method to determine true top dead center. Every camshaft manufacturers' setup instructions include detailed procedures for finding TDC. Then use a delay flash timing light to measure the advance accurately. Like the slogan Sun Electric Co. used to put on all their test equipment- - - -"We Test, Not Guess!"
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!