Re-grinding a cam, educate me please

The last time I called Oregon cam, I was told they can only adjust LSA as much as the core will allow. Which, for the cam I wanted, couldn't be done with the stock roller LA cam I had because the LSA was too wide on the stock cam.

He also cautioned against grinding too much because it'd be going past the hardened layer, even though the majority of the grinding was on the base where surface hardness may not be as big of a deal. The cam I wanted was only 240*@.050" and .560" (.350" lobe) on a 108 LSA.

Either way, he made it clear that there are definitely limitations to how much a stock cam could be re-ground or how much the LSA could be adjusted.