In my opinion....................don't bother!
they don't bolt straight into ke30's, custom engine mounts, you also would need a t50 box, hydraulic clutch setup, new radiator....rah rah rah.
the heads were never an aussie production item, only import.
personally i'd go something more common, its almost impossible to get parts for these heads, trust me i've been through it all before, these engines are also becoming like dinosaurs, at the end of the day its entirely up to you on what you'd like to do to your car,
Now after bagging out on them, if you have the money and time, yeah i guess. they don't go too bad when set up right, but i guess thats the same with everything,
just my 2 c,
cheers phatke30!