I could of gundrilled the cams for you, Thats what I do as part of my business. Also, I would highly advise against S7, the benifit of 9310 or even 8620 is that you can allow torsional twist as the core is not brittle. The S7 will be hard all the way through and become brittle as it is torsional, and develop a crack potentially. I have made many billet cams, roughing the profile is not difficult.