Baw Baw In April but I think it comes too early in the season for such a brutal race. October /Nov would be better imo as it would lead into the ToB type training/peaking.
Midlands Tour has hills and is a very hard race
M elb to Ballarat is not so much about the hills but the head/sidewinds
The Preston Mountain Classic is a great race on a good hilly course.
Bright Tour in early Dec is all about climbing with a TT in the middle.
Stratford to Dargo has a killer finish up an 8% climb.