6.4 Hemi and Matching Auto into Aussie Valiant

I am sure this question has been asked before but there is so much information on this group it is hard to find what you need.
I am transplanting a Gen 3 6.4 into a 1970 Aussie Valiant. I am aware that there a few options around for harnesses and modules to control engine but I have not been able to find much about controling a matching 5 speed or 8 speed auto. Most people seem to use early model 3 speed boxes because it is an easy option. Has anyone installed a later model transmission and got it working? What options are in the market place? I know that the Holley terminator harness and controller cannot work with a Chysler 5 or 8 speed auto.

Any help is greatly appreciated.