360 with 450hp

I am basicly building the same engine right now. It will be a zero deck 360 with the stock crank and rods. I have the same horsepower goal, but I am using a set of ported J heads that I plan on flowing 250ish on the intake @ .50

The pistons that I am using are a KB107, cam package is a hydraulic flat tappet Comp XE275HL. I will be using comp cams recommended lifters and springs. I have been told this combo with a good intake should be around 440 hp and 480 lb tq.