Ok...time to update this thread and share some of the work I have been doing. The Subaru conversion in my AX car is in full swing. I have been working on it about a month now and have made significant progress. My goal is to have it running on the dyno by end of Jan. That will give me time to clean it up and complete some of the cosmetic items before the season starts.
For the engine, I went with a 2005 JDM STi v8 Spec-C. I sourced it from JDM Racing Motors out of Canada. It appears that it previously had an aftermarket ECU (probably a Hydra) and for some reason was converted to spark plugs using the same coil packs.
Here is the engine as it arrived:
First thing I did was strip it down to the longblock and start cleaning things up.
It is mated to the original Porsche 914 transmission with an adapter plate from Outfront Motorsports. Because I now have the Porsche bolt pattern, I could use my Porsche engine stand yoke...Bonus!