[MichiganMat]

You might look around a bit, Subaru turbo engines mated to bus trannys are a hot ticket in the dune-buggy world. Check out any Hot VWs mag, they are all over the place. I dare to say that you'll definitely need an adapter, but there should be plenty of kits out there.

http://www.nmcollector.net/buggy/fugitive/adapter.htm