What do you think about this statement.........

6500 isn’t that much RPM.

For who for what? Just because you can doesn’t mean you should.

There isn’t a damn thing “superior” about a junky stud mounted rocker. Nothing.
The only time I've had stockish engine spin
Past 6500 was an L79 chev 327/350 hp motor that I put a solid lifter Sig Erson Cam in. I spun that to 7500 a couple of times