That was over 10 years ago
Damn... 10y already...
I've merged a wiring harnesses for a 251->205 swap: wiring isn't that bad - just a bit nerve wracking on the first wire. A NA-NA swap shouldn't be overly different. Documentation is a bigger concern, but really - the NA connections are inconsequential to that of the turbo models. That said, if electrical isn't your forte - hang back.
Biggest consideration, in my opinion, would be the physical fitment of the whole thing. I would plan for custom plumbing for the fluids but again, nothing completely unreasonable.
Reliability on the EZ30 has been superb, our 2001 Outback has around 350k on it and enjoyed winters from , and while the body is rusting a bit, everything inside works like a hot damn. I don't think that it's comparable to the B7's which are in a class of their own - but those timing chain guides. Ya. One big bonus is plentiful and reliable access to service manuals for almost every Subaru ever manufactured! "Vorsprung durch Technik" indeed... At least I have a whole slew of new tools for doing work on the wife's A3.
WRT Fuel: Only the new 3.6's have dropped the premium fuel requirement. Our old 2001 still likes that premium juice - but Costco doesn't disappoint.
I've long been thinking of building a wagon with the EZ30, but that's not in the cards right now - different goals and priorities. Maybe in a decade as a project for my son.