I think anything that is going to regularly see north of 8500rpm needs a billet crank, and the ccw design certainly adds stability. Nipping the 8k chip once in a rare while is one thing, routinely shifting and holding through the traps at rpm above that demands an investment in the crank department if you want any chance at long term reliability. Just my two cents
That, and stroke. I had a chance to buy a 4.75 inch stroke non CCW crank, and passed on it after hearing that they didn't fair well at high rpm/high horsepower. That is also the reason I have a nice 4.560 stroke non ccw crank on the shelf. Someday it will make a great torque motor combo, rpm of 6500 or less? That and my 440-1 heads ought to generate some decent power down low with 580 cubes.
