New to Mopars---BUT always a cool different car fan.

Sox fan (cubs suck) and a /6 powered early cuda...
Looks like he's being raised right..
And no, 3.23 isn't "too tall" of a gear for that combo, sounds like about the perfect gear for a cruiser, wonder if there's something wrong with the engine.. could be as simple as a tune up and valve adjustment away from running right ..
I've had /6s in pick ups that held their own, weighs more than your car....