It is possible...
In the event that the tranny can hold up, and the ESP actually lets the car move under a heavy right foot, Kenne Bell makes a hemi super charger unit, as well as what they call a Boost-a-pump and a Opt. II computer mgmt program. Given, these are all currently ram mods, but the possibility should exist for a retro fit. If a tranny can hold out for 390 lb-ft stock (IF being the definative question) there might be some chance for it staying in one piece. At the very least, the computer kit by KB or a similar one by JET for the hemi may give that much more positive fuel ratio, or disengage the speed governor if desired. Personally I'm not sure I would want to do anything that would void the warranty, but it's only a matter of time before someone comes out with a blown 300C.
While I'm still on the subject, has anyone ever heard of advancing cam timing on pushrod engines? I have only heard of this technique on imports, and I believe the tradoffs for more HP were heat and lower gas milage. Last thing, just getting a stock hemi to breath better with a K & N or Airraid high flow filter, and possibly a throtle body spacer or mass flow sensor might add between 15-20 ponies. Whenever anyone actually completes a performance mod,
then we'll have more to go on.