If you are interested in an 18rg there is one a SON imports(engine importers) in Wangara I was there on saturday and it is on their workshop floor. it does not look in fantastic condition but I would think a rebuild would be the go. It is fairly complete with solex carbies and 5speed The offered it to me for around $800/$900. bit pricey. but were willing to give warranty if a paid a heap extra Not worth it as I have a pretty good 18rgu sitting in a corona and I picked this up for $600. complete car. soon to go in a ra28 that is the world longest restoration project If you need more info give me a post and I will get back to you
Cheers
Dave