Blake, welcome to the forum.
Watcha lot of videos and read a lot from people who have done mods on the pentastar engine. From what I have read and watched (I have a 392) the V6 is tough to mod as it was not really designed to be "performance enhanced" and the aftermarket has largely ignored this engine. The "usual" upgrades, CAI, headers, exhaust...etc typically don't give the bang for the buck that you'd expect and you could be disappointed.
Now, having said that, your car will respond really well to suspension modifications. If it were me, I'd put my money into shock towers, sway bars, shocks, springs....etc. The 300hp pentastar is a pretty stout performer and your suspension mods will give you an immediate "feel."
So, in answer to your question... I don't think a 78mm TB would give you much of anything.