Gen 3 HEMI Torque upgrades?

If you put a 6.4 car engine with variable intake manifold, you'll have all the low end torque you need. That engine is a beast. Could research and enhance that with the right cam. You could put that intake on a 6.1 also. You don't necessarily need to control the intake with the ECU. There are plenty of guys in the LX / LC world who have put the var. intake on a 5.7 and hooked it up through external electronics timed to engine RPM signal.

Another possibility is to use the 6.4 truck engine. It has variable intake also, but I believe makes even better torque than a car engine. Also, by using the truck engine, you virtually have a Hellcat block and heads, with only minor differences. Do a little research on the torque specs of the car and truck engines to confirm this. Pulling this out of my head right now from prior readings. Don't have the time to research this for you but I believe this will point you in the right direction.