Most LS2 guys with bolt ons, such as intake, headers and such, only do like 380-400. Everything varies so much, so I wont say this may not be true. But Just a cam on an LS2 making 450 sounds high to me, but I certainly am modest with my knowledge, so I could be wrong.
I have a 4000 Mile C6 coming in next week. We are going to do a baseline, then install for some 7/8ths tubes, LPE intake, catback, and 160 t-stat and a tune. My guess he doesnt get above 400, who knows.
Either way, the LS2's are great power plants, but we will be working on a new L92 power plant with some of our heads here real soon, thats one im very much interested in.