1GGEs are slugs, pure and simple. A good healthy 22RE probably has more guts than a non-turbo 1G, if only because of the extra 400cc capacity. Since you intend on going 1GGTE once you get off your Ps, then I highly recommend just sucking it up and leaving the 22RE as is for the moment - why spend money on a conversion when you're going to be spending even more money in a year or two's time to change it all anyway? Can't remember Vic laws, but are you allowed engine changes (I know in NSW you're not)? Or are just turbos/superchargers not allowed (there used to be a power-to-weight thing too, right?). In that case, maybe think about going VZ/MZ V6, you can strap a supercharger on once you get unrestricted, it'll be different (but plenty common for parts, and relatively cheap too). plenty of guts as you'll be basing off a 3L instead of a 2L, etc etc. 1GGTEs are a very common install for Coronas, so at least if you do end up going that option there is plenty of info out there for you, which is a plus.