Hi Mako,
Sorry I missed your post. You might be able to pick up a decent second hand Cleveland in Melbourne through
The Melbourne Trading Post Just go in and have a bit of a search each week.
The
Super Southern Swap Meet happens at the end of February In Ballarat. This is Australias biggest swap meet now and you will very likely find a good second hand Clevo there.
If you want something new try ringing arround some of the more reputable engine reconditioners and see what they can russel up for you. I would definitely bee looking at replacing that 302 with a 351 for a start since it costs the same to rebuild either. Keep your 302 rods and use the 351 pistons with the pin height to suit.
Good Luck