Ditto 427 sharp.
Upper rpm is limited by valve springs. They float, your done.
The 460 crate motors redline 6,950 though I have exceeded 7k without float. Max hp is at 6,250rpm, so reving through the six's is somewhat expected.
I run a 6k rev chip just to limit the engines punishment. It has alot of power without exceeding 6k. Not like a motorcyle engine that has to get up there to come alive.
With enough
oil supply, the stock blocks and cranks survive fine.
In the 460, enough
oil supply is the hard part.
Bob