The 3G Hemi is a great engine but hoooooo-leee crap, it isn't as cheap as you'd hope.
I looked at the costs to do an installation in a '70 Charger. The mounts and exhaust are the easy part. When you look at the front end accessory drive, the computer to run the EFI. the fuel system changes too...The swap can run $6000 IF you have a FREE engine.