I've only got 140K on the clock on this car, so this is not going to happen anytime soon (the current engine is barely broken in fer goshs sake! if/when I have to swap out the engine, I'd like to look into a 3.0 H6 if it will fit in the car (engine mounts and such). If not a newer H4 will work great as the car has plenty power as it is (I hit the gas, and the car goes right now). Just looking for something to put on the future projects list.

One of the Legacy Outback H6's was put into an Impreza, so I dont see why it wont fit in a first gen Legacy (same size engine bay for the most part)

Cool! That means that if the engine ever dies on my baby, I can drop something in that will make it even more insanely quick. . .