Nah, I don't agree with this at all. The majority of classic Mopars were slant six and 318 models where there is not much to gain (relating to counter-acting torque) by moving the drivetrain over. The axle has the offset because the axle shafts are the same length. The pinion gear has to contact the ring gear at a 90 degree angle and that requires the pinion shaft to be to one side/offset.
I think they offset the drivetrain to allow room for all the crap they stuck on the left side. Battery wiring, steering box, clutch linkage or auto trans linkage and cooling lines, starter, neutral safety switch wiring, speedo cable, etc.
I've wondered numerous times why Ma Mopar crowded the left side with all that crap. Why the hell didn't they put the ATF cooler lines on the right? Why not the starter as well?
To add...
I never sit in my cars getting alignments. I'm not so friggin fat that my weight is going to lower the car enough to matter. I don't run skinny torsion bars either.