I would not even consider that intake for a combo with that power level intentions. I am assuming this is a boosted combo, look at the Holley Systemax II, TFS-R, Edelbrock Vic 5.0 or a Spyder style set-up. Really depends on the rpm range of your EXACT combo.
The GT40 upper will not allow that kind of power, so the nice look is what limits it's potential. One of my GT40 lowers is making 606RWHP but it has a box upper on it and 17# of boost.
i would go with the holley systemax i love that thing.i had the trick flow track heat also a very good intake but i can tell a difference when i put the holley on.