Engine Choices: What interests you the most?

It's Mopar, it's a muscle car engine, it's unique & yes it's a hemi - Aussie six cylinder Hemi
http://bringatrailer.com/2010/10/16/cylinders-not-carbs-aussie-1971-dodge-charger-hemi-6-pack/
And they were in A-bodies! There was even a factory package with the tree Weber carbs.

I know there are guys down under that are working on them.

A stroker with some sort of blower or just a stroker with high compression ratio & cool Webers should do it.
A Prowler rear transaxle would move trans to the back & give more room in the tunnel area.

Or if you want to be "green" a stroker 5.9 Magnum with Viper catalysts and running on propane would be considered a zero emissions vehicle.