So much of the Australian development took place after it stopped production in America then...

We had the iron crossflow head at that time, I'm sure, the alloy head followed soon after, then fuel injection. The overhead cam model came about 1990 or so, IIRC.

But I think it was only a 250 here from about that time.

Did you ever have the '2V' head there? That came out here about 1972, with huge inlet ports and a separate manifold on the same side as the exhausts. Gave huge grunt.