not worth the hassle imo. unless you go for a japanese k20a right away, a b18c swap will be much cheaper/less invasive and will give you similar performance as an unmodified a2. a friend of mine had a 98spec b18c in his nine and was keeping up with most of the k20 guys around here
but thats just like my opinion dude...
also, do something about that sig, its gigantic!