Cost of engine rebuilt in Darwin, NT?

Travel Info
My 1995 Mitsubishi L300 4WD finally threw the towel and needs either new engine or rebuild. At the very minimum, it needs new piston rings, or more likely, new valve stem seals. The point is, the engine needs to be taken apart or taken out and replaced. I am in Darwin, NT, can someone recommend an honest mechanic who can either rebuilt this car or locate new engine in good condition? Needless to say, I would like to get it done as inexpensively as possible.
Any tips will be greatly appreciated, and I mean it!
Cheers