I did the upgrade... and no I don't have any meaningful before and after because I changed several things at once. There is another way to look at it though... Chrysler made the upgrade to the heavier tie rods on heavier cars for a reason.

When you put big sticky tires on lighter B's, E's and A's and drive them hard, the steering loads will increase. Upgrades Chrysler made for the heavier cars may be "just right".