Aussie Hemi 6's

JOHNNY MOPAR said
the hemi 6 came in three configurations

No. Three displacements. MANY configurations. 1bbl, 2bbl, 4bbl, 6-pak, multiple different cams, etc.

australia experimented with a number of modifications with the '' pacer ''

No. The Valiant Pacer was not an "experiment". It was a production model with engine and other performance upgrades, available on the '69 VF-model (slant-6), the '70 VG model (Hemi-6) and the '71 VH model (Hemi-6).