I am certain someone out there can grind you a cam to fit YOUR needs. That is why i want to push for a custom cam in your case. Looking for 600 hp is going to require some decent rpm, 6500+. My thinking is, why not go with a solid roller with lobes designed for endurance, and the duration, lift and LSA all spec'd to YOUR combo? Shelf cams are meant to do OK across a large variety of combos and sizes and are more of a compromize than i personally would want to put into a build that is going to cost $8000+? For a few $$ more, get the best brain for your beast!