Jeanpaul,
As far as i'm aware,you will need a copy of the import approval and a copy of the title.
Also a purchase reciept from the sale here.
As far as rego goes, once it is up and running, in NSW you will need a blue slip from an authorised RTA inspection station.
As long as it is in original condition, ie engine
size etc the only thing you should need to change are
the headlight sealed beams tho local ones.
You may already know that in NSW any car over 30 years of age doesn't need a L to R conversion.
I hope this helps.
David