Destroked LS2

[DJW32]

This is what I'm thinking about
I'm looking for 750-800HP

How about an aluminum LS2 with a 4.8L crank, 6.0L heads with crane cam springs, edle. intake,forged internals, and a twin turbo setup (2 hi-fl 61 turbos, this is subject to change for whatever will work in the most efficient manner)
Questions:
1. How many cubic inches is that(364 cubic inche LS2 with a 4.8L crank)?
2. What will I be giving up by destroking the motor?
3. How high can I spin the motor?

Thanks, David