I'd think about the new Pentastar V6 which puts out 305hp in the new Challenger.

Allpars old 3.5 engine page;

Chrysler/Dodge 3.5 liter V6 engines

The 3.3ltr (pushrod v6 similar to the 3.5) actually has a little racing pedigree to it being massaged by no other than Shelby for the failed Shelby Can Am Racing Series of '89.

The Shelby Dodge Can-Am race car, with the Shelby race version of the Chrysler 3.3L V6 engine