After 1969, all Aussie sixes which weren't ohc, x-flow or 2v got a vaugely square log six. I'll have to look around for one, but they look very similar.
These had sqaure logs had casting numbers ARC9DE 6049 and a revison code. They came out with the XT Falcon and were also found is some later Fairlanes, Cortinsa, Transit vans and the XW/XY/XA/XB Falcons up untill 1976.
Before that, all Aussie heads were simialr to the 52 cc US 170/200 heads, and were round dog turds with a C1UE 6049-A casting number. These were found in XK, XL, XM, XP, XR Falcons and Futuras
No photos, my garage looks like the nutty professor had a high (cast) iron diet and then exploded.