Motor mounts will need to be made. You maybe able to convert your existing ones to fit the hemi. Not sure if the Dak 4X4 is steel or aluminum.
Mopar has a big TB. expensive @ 500.
Your computer can be re-tuned to run the hemi if you don't use the drive by wire.
Not to sure what year they switch from a 32 reluctor wheel to a 64 on the 4.7. Something to think about.
Matt