I was thinking about this swap just yesterday. I happened to see a 914 on the road in pristine condition that day as well. So I google searched and found this:

http://www.renegadehybrids.com/914/914.html

i know and have talked to a guy that put an ER27 (XT6 engine) in his 914. He also has done an EA82T swap into it as well, then went to the ER27, i spoke to him about some issue he was having a few years ago. He has a webpage with pictures of it here:

 

http://www.etischer.com/914xt6.html

I checked out his site too. The Renegade conversion pictured on their site is, according to another forum, an EJ20T. They've been using the stock Porsche transaxle, but I can't help but wonder what it would take to swap in a complete STi powertrain (6-speed trans). I know the viscous coupling would have to be replaced with a direct drive of some sort, but beyond that (axles, mounts, etc.) is something I would like to know about.