I don't know much about the car, but I recall someone saying it was proceeds of crime or involved in the early 2000s Melbourne gangland shootings. I don't know how true this is?
Aside from that I really don't have much history on it, I have become a self anointed 240z history guru it seems but I never intended to do the work I've done with the registry for them. I find keeping track of 240z's has kept me busy enough, that I'm hoping someone else will do the work on 260z's 2 seater (RS30) and 2+2 (GRS30)s, but so far no hands have been raised. :). So I'm afraid my records of 260z's are non-existent.
Perhaps I'll change my mind in time?
Either way re: your 2+2, it's a project and I hope it works out for you. The community is happy to help so feel free to start a build thread and ask away.