Sorry man but this thread will either be locked or moved shortly. It really belongs in the conversion part of this site. That is where you will get all your information on swapping into a third gen. I believe that there is a ton of info on putting an LSX into a thirdgen in that section.
On another note, I think your gonna have issues fitting that motor with that high intake under a factory hood, may wanna change out the intake.
2012 Kubota ATV 400