Big Bore Question

I have a question about Big Bore kits. I would like to purchase a BIg Bore kit and was wondering what the best kit would be for my type of riding. I ride dunes. TRails mostly open and I don't race. I want something that is quick but has a good top end. I was thinking about the Trinity 465 kit that is just 465 bore, cam, port, pipe. then powroll valve springs, hardfaced rockers, 39mm FCR carb, Heavyduty clutch springs, and Airbox Lid. All for 2470.25 is that a good kit for what I want.

[airheadedduner]

For dunes I wouldn't go bigger then 440. The load on the motor could cause cooling problems. Maybe i'm wrong but I would concentrate some of that motor money into making your bike wider for the sand.