I don't know of any people if Australia doing much work on 22 engines. Most of us here go for an 18RG, 1GGTE or something else and chuck the old boat anchor 22R.
However, they do a fair bit of modding of these engines in the USA 'cos they didn't get the twin-cam engines that we get over here.
They do a 22/20 hybrid engine which pulls about 150hp. I don't want to advertise other forums here, so PM me and if you want to know more.