360 Magnum building on an existing bottom end

So I theoretically am basing my build from a web page call Dyno Proven 360 packages, package # 9. Comp Cams 305AH-8 camshaft with .525"/.540" lift and 305/312 degree advertised duration, 253/260 degrees @ .050", 110 lsa, installed at 108 intake centerline. 495 h.p. @ 6,000 rpm 500 lbs. of torque @ 4,500 rpm). There is a lot more to it but basically with the right flowing heads (260+ cfm) and 10:1+ compression you could achieve 495+ HP. I'm not sure if the lift is based on a 1.5 or a 1.6 ratio rocker arm.