What year is your car? What color is the engine block?
That may be the Bosch distributor from an Australian Cleveland (I've never seen one). If so, oem repair parts will be available from Australia.
In fact, if that is a Bosch distributor, an american distributor will not fit, because the distributor shaft guide hole inside the block is smaller than the guide hole in an american block.
The white piece inside the distributor is an "inductive pick-up", the metal box (silver, blue?) is a "module".
If those are indeed Austrailian parts, I would buy a rebuilt distributor from Australia & a replacement module, drop them in, set the timing, and you're good to go. Don't neglect to replace the coil while you are at it.
take care, George