Thanks for the great info on this old thread. It really was a cool car and nice to see one here in the USA. I might have a couple more pics, I'll look in the next few days.
It's a VH Valiant Charger, Aussie assembled, US designed. It is carrying the 770 badging at the back, hence the padded vinyl quarters and doors.
Wheelbase is only 105 inches, based on the A body, but with a bit of B thrown in too.