some drive train questions

[Skooter]

So this year I am going to start properly doing things to my car on my list are shaved door handles, manual conversion and maybe LSD and possibly cam.

My questions are,
1) I want to fit an ef/el gear box because apparently they are stonger and nicer to drive, is this true or should I just go a eb-ed box?(I dont want an ea box).
2) If I do put an ef/el box in does the ef/el ecu have to go in aswell(I dont want to do that resistor mod thingo) or would a manual eb-ed ecu do the job and is that the only thing different between that and an eb-ed box like does it still plug into that plug under the car?
3) Would my wagon tailshaft fit the ef/el box?
4) with diff gears, can my single spinner diff be converted to LSD with different gears or is it better to just buy a second hand lsd and have it serviced?

Theres probably more questions but i cant think of them right now, by the way it's and '93 EBII I6 wagon s-pac