Hey Tim,
I did my own conversion from the NA to Gen 3 3sgte with a halfcut from Japan, and no joke, the hardest thing was wiring up the ecu + loom along with making the cluster work. Everything else was straight forward.
Everything just went straight over - however, I will say to do the timing belt, water pump, idler bearings before you put it in - so much easier with it out and its good to have a peace of mind. Check the clutch as well, mine slipped massively so I had to change it after I had it running in the car - bit of a pain.
I have a heap of info on gen 3 swap, PM me your email address and I'll send it through. I went off swaps on mr2.com, they actually have some great info.