cheapest way to get hemi 3g going?

New ecm ( they use a 05 truck pcm) , wiring harness, and a new dbw pedal, you are looking at $1756 shipped from Hotwire.
You could find a used ecm to save a few bucks.
This would be the cheapest "plug and play" setup brand new that uses all the factory sensors including the DBW throttle body.