Why the offset with engine with the older mopars? To me it looks more to the passenger and slightly clocked, not straight in there. I've never seen this in my other cars. Might be a silly question, but I'm curious.
I was told years ago by a fairly goofy fella that under full load or wide open throttle, everything straightened up from the torque of the engine. It sounded a bit nonsensical to me but I'm no engineer.
I've heard a few reasons.... Most concern giving more room for the steering box. The engine mounts a little lower because it can sit next the steering box. The drivers foot well is larger. It matches the offset in the pinion gear in the rear end better and allows for same length axle shafts.
I've never seen any verification of any (or all) of these... Clearance around the steering box seems the most logical.