Max RPM

I ran a 360 with a cast crank in a dirt track car for years at 7200 RPMs. Everyone else told me it would break too. I never did break a crankshaft. Hell I even ran stock rods. If it's correctly prepared and the oil system is up to stuff it will live. But for a street car I think it's over kill. Plenty of power up to 5500 or 6000 RPMs