go with the starion, if you check out starquestclub they have a nice t56 swap!!!

But just remember, these motors make NO power on they're own, regardless of what you do to make it breathe better or increase displacement the gains will be minimal, get a BIG ass turbo and itll make power all day long. Just remember the pistons in it are worthless and need to be swapped out for forged, get NJV heads, AND a balance shaft eliminator kit and youll be good.