Have you checked the end play of the crankshaft? It's not uncommon for the thrust surface of the #3 main bearing to wear, and let the crankshaft move forward, especially if the clutch isn't adjusted properly and the throwout bearing rides against the pressure plate fingers all the time. The crankshaft end play must be correct before doing the cam plate measurement.
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!