@John_frisina
There is an article on forums.turbobricks.com on converting to use a much higher quality GM style valve (much cheaper as well) I'll see if I can find it and post it on this thread
For hoses... American spec 94/95 hoses work fine and cost way less than the australian spec ones do
For the heater core
@Dauntless has a suplier in the UK that offers a really good quality part in RHD for a really resonable price... I just dont remember who the supplier is so hopefully he will chime in :-)