RJC power plate makes more HP, cures most of the fuel distribution issues, reduces knock due to the better distribution of the air, and is cheaper! Stock upper is poop too. Port the manifold, and remove the egr bosses! At LEAST remove the egr boss from the upper. You can probably add a couple hundred bucks for manifold work, and gain MUCH, MUCH more HP. Ask the guys in the 9s with stock t bodies!
Just my opinion.