I'm with Zach, a low budget turbo build with mild boost, 12 psi, and you'll have an extremely street friendly 350-400HP that will get fabulous fue economy. The turbo thing is waaaaay over-rated as being difficult, complex or expensive. It is the cheapest way way to doubling your HP. Seeing that you have a set of forged slugs in there already makes the decision even easier. Use your heads, a chinesium charged air cooler and drop $500 on a blow through crb (or build one yourself), for less than $1500 invested.
And if you get crazy, drop $50 on a Mac valve for some adjustable boost control.
