For what its worth, we raced 510's with the stock head, holley 350 rule many many many years ago.
We stumbled across an assemetric cam made by DL Potter in Mitiplas California.
I can't remember too much about the grind numbers (28 years is a long time)
I think he called it grind 5 or 6 ???But that thing made absoutely incredible power from 3500 to about 7600.
It was a wierd thing to time but...
The car ran on the pavement and when we got told to not come back with it it ended up on the dirt and did just as well.
FWIW maybe hes still around, was a real curmudgeon when I dealt with him, in a good way.
He sure knew his stuff.