8.25 or 8.75 rear

I've ran a 8 1/4 in my car for the last 15 or so years. It has held up to modded 360s just fine. I am now running the same rear diff. with a detroit locker and 3.25 gears and it's still holding strong. I have been told the 8 1/4 will handle 500 hp from the Dakota guys.