A couple questions about supercharging a 440

What 70Duster440 said is great advice.

I wouldn't worry about cast crank at 600 horse. And yes that should be easily achievable. That cam would work fine. You're not gunna be putting crazy boost through it anyways.

My suggestion would be to go with the 8-71 instead of the 6-71. You will be able to turn it slower to make the same/more boost. Which is always a benefit. The slower you turn it. The less you heat the intake charge. The less chance of detonation you will have. You don't mention what heads you have. But they will also play a significant part in detonation reduction.