This topic has come up a few times in the past and I just found this web site that has some useful information for anyone contemplating such a project. I'm not sure if everything is detailed but it certainly would give you a good start of what to consider.
http://www.doyouevenhoon.com/datsun-240 ... rsion.html
Some of his other posts about fuel tanks, alloy sumps and power steering conversions are interesting too.
S30 LHD to RHD Conversion
Adam's Youtube is pretty interesting. Here is the playlist
https://www.youtube.com/playlist?list=P ... PHGP202PIp
https://www.youtube.com/playlist?list=P ... PHGP202PIp