Regrinding a cam reduces the diameter or the base circle and can create problems with pushrod length and the position of rocker arm adjusters, locknuts, etc. If a new cam is available, getting a used one reground doesn't make good nonsense. Back when almost all the flathead Ford V8 race cams were made on stock cores with some pretty radical regrinding involved, Johnson adjustable tappets were available in "overlength" dimensions to compensate for reduced base circle diameters.
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!