Rear disc brakes on the AC Super 9 will be a headache. I may be missing a few things, but at a minimum you will need:
LC transmission housing (they are different)
LC gear set
LC rear wheel
LC brake disc
LC brake caliper
LC brake line, master cylinder, brake handle, etc
Swing arm
LC exhaust (AC exhaust is different, because AC model does not have the swingarm. You could modify the stock exhaust to work though...)
There's probably a few more bits I forgot.
For the CDI, switching to the LC CDI works great, but you've got to rewire a bunch of stuff to make it work. Just did one a few weeks go and it runs like a champ.
Hope that helps some.
~Josh
