I believe he's in California, the state that just passed legislation stating that you can't "aftermarket tune" the engine anymore.

The different tone ring on the crank means he can't run a 2009 or later engine.

The swap you did is more of a bolt in.

On the 2004 era Durango's (AWD/4wd) you can't get at the torque convertor bolts with the engine sitting on the engine mounts.
The aluminum bracket that bolts the engine to the trans at the bottom won't even come out until you lift the engine up.
You can unbolt the bracket, but you can't move it out of the way to get at the torque convertor bolts.