Isn't the intake manifold on that engine set up differently so the throttle body is aiming straight up? I dont think that there are any for that engine.

Just off the top of my head running 6 lbs of boost (if that engine can handle it), you should be able to keep up with an LS, but I'm doubtfull about it beating a GSR.

I would recommend a motor swap instead. Using a dx engine as the base for speed isnt exactly a good place to start. If you would consider this we can give you some opinions for a certain price range.