Factory RWD Water setup won't work on a 4AGZE (purely from what I've heard and seen on the net) as the thermostat and outlet from the head foul on the SC. You can use the normal FWD remote thermostat housing and FWD pump and head outlet. You'll need to modify the pipes running along the engine, but there are about 1000 writeups on how to do that.
Other bits are:
- a spacer so you can flip the intake pipe leading to the throttle
- modifying SC outlet pipe and inlet manifold for a front mount
- mounting coils somewhere
- maybe moving the alternator to clear the swaybar (can be an issue in AE86s, but sounds like you've got a Datsun anyway)
Again there are a bunch of writeups with way more detail floating round the net.
Hen