Lots of guys run the Gmax kits up to ~800hp maybe more, you will need to choose a converter also (1058 is always a good choice if you go with suncoast).
IMO don't bother doing head studs, stock bolts are fine (its the gasket design on some of them, at that point studs aren't going to help you), just run the stock turbo for now and get used to the power. Put all that extra money towards sleeves / centerlink and then you can launch it good in 4wd and it will FEEL faster than a big turbo truck that CANT do a 4wd launch.
On my truck in the Max effort tune (2wd) it will just skin the tires on the street at low speeds so look into getting it to hook up before you start making 700hp...
^^^Contact IdahoRob (he runs ATP) he will set you up with good SAFE tunes, he knows what it takes to make an engine live at the power levels you are looking for and his prices are hard to beat^^^