Need Help

You can get Hemi 265's on ebay.com.au for next to nothing.

here is a list of places to get them plus parts:

www.moparmarket.com.au
www.pentastarparts.com.au
www.hemiperformance.com.au
www.valiantspares.com.au
www.ebay.com.au

You will need a new K-member possibly, new extractors/headers which you can do a search for online. I would go for a Romac e49 spec balancer if you are running non-power steering. Also check out www.chi.com.au for the 400hp cylinder heads. www.aussiespeed.com.au for the manifolds. They do run out of puff toward 4500-5000k.
You will also need all Aussie Hemi 6 starters and distributors but you can find this stuff online esp. at moparmarket.com.au and ebay.com.au
If you're really keen go for the 6 pack setup and fry the tyres.

good luck

Brett