been done a few times on here, and once by me.

L20b is a tall motor and so it is a little hard to get it under the bonnet. You can either cut the sump down, or dish the crossmember (probably a better idea). Needs custom engine mounts (obviously) and tunnel will need modifying. I just cut the tunnel out of the 200b and welded it into the ute, but there's plenty of other options including buying the prefab tunnel from maddat ( i think they do them)

anyway here's some reading material:
link1
link2
link3
link4

check out my photo album too, i think there's a couple pics in there...

sorry, can't help with the 200b struts.