I had a 2008 Charger donor car, so I used the complete drivetrain, including the NAG1. The NAG1 is a very strong tranny, and is geared to be a great match for the stock 5.7 Hemi.
I used the RMS AlterKtion front suspension, with the Hemi mounts that are included in the kit. I was able to weld them in a few inches forward of where the stock small block would go, so I didn't have to modify the firewall or trans tunnel.
I used the factory Charger exhaust manifold on the driver side, and a 2008 Ram PU exhaust manifold on the right side. A rear sump Jeep oil pan an pickup allowed plenty of clearance with the RMS setup.
Most people don't run the NAG1 because they're afraid of the wiring/controllers associated with it. I used the Hotwire setup, and it made the install very simple.