Sell it and get an SRT6, you'll be at 330 HP with possibility of going to 400.
Do not, I repeat do not even think of a turbo, NOS is a possibility but you need to know what you are doing, and even then there is the continuing expense.
As it sits, you can do a CAI, 74mm TB and ET tune and be somewhere around 260-270 HP.
Add NOS to that, and you MIGHT be somewhere close to 300, who knows ?