The LS setup spins reverse rotation afaik, so I never even considered that a viable alternative.. That being said, the GE fanblade clears a Koyo 3-core by quite a bit so long as the blades are trimmed to clear the waterneck. I don't see the Mishimoto being an issue, and most of the time shroud fitment is just a matter of making small adjustments, but That's one thing you'd have to play around/experiment with.
In regards to the post about the GE and GTE clutches being the same, the issue with that ( I thought the same at one point) is that the clutches all have different part numbers as verified by Jeff Lange and a few others.