lol, yes AC is a must in AUS, but a targa top will be worse if your trying to avoid heat, the glass absorbs as much if not more heat, and removing them just means you get burnt to a crisp.
how thoroughly did you remove the AC? with the engine unless it's something special(fully rebuilt and forged etc) then it's not worth bringing over. it's not exaclty common to get a factory turbo mr2, but the engines themselves are easily had from importers etc.