A340E will drop in no hassles (mechanically speaking).
Tailshaft WILL need to be changed. (or at least the yoke/spline will be)
Not 100% sure if the MX83 shaft will bolt in. If you can find one cheap its worth a shot.
Electrically you need to make sure the A340E you have matches the wiring loom you are using, as they changed plugs etc many times over the years.
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