C337 requires a multi engine endorsement in Australia as well.
So if you don't have a multi endorsement already you have to do the full endorsement time.
If you then want to fly other multi engine then you have to do the full multi engine asymetric endorsement. So you are better of having a multi engine endorsement on something else first (eg PA30 or BE76) then doing a C337 endorsement which should be no more than an hour or as the flying training organisation you use requires.
As stated just don't try pulling the wheels up during an engine failure as it costs at least 10kts and upto 300ft especially with a rear engine failure. See Bundaberg accident about 2 years ago.