The 750 motor fits in with no problem. However, I think that all of the engine mounts line up except for one. I have seen it done with no issues. So, you would want a '98 or '99 motor.
I don't know about the swingarms.
Eric is right about the FI and frame questions.
Also, I am not sure what kind of wiring harness changes you would need. I am sure that you would at least need the 750 ECU.