Chevy man needs a Mopar lesson
There are two main reasons that the small Mopar has more power than the small Chevy and Ford, rod length and cylinders heads. The longer rod part was stated by needsaresto. The cylinder heads have multiple advantages, the valves are more towards the center of the bore and have less angle from the bore centerline helping flow by unshrouding the valves. Because of this valve angle the combustion chamber can be shallower and flatter yielding better combustion, this is why Mopars need less total advance.
Chuck