Sorry for the late reply, I was out of town. Seems like you have much work to do. The 2.5 is in need of a rebuilt as are the heads. If you use a Phase I block pistons the STI gasket will work. If you use a Phase II block with Phase I pistons you will need the thicker Phase I gasket as the pistons slightly come out the block. Phase I block has the thrust bearing in the middle and Phase II at the flywheel end.
Matt Monson is you man in your area for this type of conversion, plus he might have a crank and parts to get you moving.
At present the engine is waiting to be installed but I'm away again until the new year.