That cam is probably worn beyond the point it can be reground. There's only so much material left to reshape the lobes, and once the nose of the lobe is gone, it's unlikely that enough material could be ground off the base circle to regain the proper timing and lift. Send me a private message- - - -I might have a work-around for you that needs to be discussed in a one-on-one conversation. Click on my username and select the PM option from the drop-down menu.
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!