Something worth mentioning is that the 2-inches tall six pack air cleaner does not flow enough for a 440 at high rpms.
K&N do a version 3-inches tall that flows just over the amount of air you really need.
I doubt it will fit under many hoods but I am pretty sure it will fit under the Challenger R/T hood.
I will find out for sure in a week or two. If anyone has already done this it would be cool to know. If not then I will find out for sure in just over a week and will measure how much clearence is left. If any.