Might want to post this in the N/A Motor section, or over at ultimatesubaru.org. Will get a lot more traffic.
I'll comment, but it's really only a guess. The block and phase 1 heads will physically bolt together, probably will be a compression change, which might not be a huge deal. Depending on your plans you might be able to put together a frankenmotor (google it). Phase 2 block, EJ25D Heads, and the intake manifold off your phase 1 2.2. Probably a few different ways you can go, there are folks way more knowledgeable than I, hopefully they will chime in!