How about swapping the "turbofold" onto the GS. As far as I know all you need to do is figure out a coolant line setup in addition to the oil lines.
Why are you looking at the bottom end only? Check out any SRT forums, I've heard of people swapping the turbofold from the srt to the Neon which would basically be the same motor as the GS(correct me if I'm wrong). As far as I know it seems to work good. Check some SRT forums to see what they are doing to make it work. Thats about all I know.
Good luck with it.
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