I make 320AWKW. You can see in my sig whats in it. Pretty much everything except the forged internals are needed for 300kw safely. Especially oil stuff.
Ill be pushing more soon with the -7's as well. Don't bother getting 34 injectors just get aftermarket ones. Basically before you can look at modding get your power figure and look into turbos. If you want response go the -7's (they will make anywhere from 290-330kw on 98) or go the slightly less responsive but more power -5's. They are basically the same price.
From there decide what fuel it will be tuned on.
When you know what turbos and fuel you will tune it on everything else will fall into place.