As awesome as doing this is... It's not legal in pretty much any state in the US. There may be a state that will allow it, but none of the states I've lived in legally allow you to put in a larger than factory motor.
The FA20 is a beast in its own right. Guys are making well over 450whp now without issues. It is a very potent engine. I was expecting the engine to be the weakest link, but it isn't so far. 350whp daily should do very nicely and hold up for a long time.
The HKS kit is just garbage. Looks like they hired a bum off the street to develop it. I'm not a hater, but it is retarded. The piping looks like an afterthought to the supercharger placement. The Vortech kit looks a million times better, and is nearly half the price.