Transmission Question

[EA Ghia]

Hey,

Seems like my automatic transmission is gonna shat itself pretty soon, as its slipping through the gears a lot, just doesn't drive as healthily as it should and after a bit of a thrashing (nothing hardcore), I noticed smoke/steam coming from under my car. After a quick look, it seemed to be the transmission leaking onto the exhaust or something. Could be wrong though.

This basically gives me an excuse to spend some money on something a bit more 'performance'. I drive a 90 EA Fairmont Ghia and I figure that instead of getting a reco stock tran, I could just upgrade. I'm leaning towards an auto (I know, lazy!!), but a manual isn't out of the question. What I'm wondering though, is if I can put a transmission from something such as an EBII or an EF or even an AU, straight into my EA? I know that if I got one from an AU, I'd basically have to change the whole engine, but what about the other E-Series models? Will an auto fit straight in without too much fuss, or do I have to get a different engine as well?