During the 60's and 70's the design of the mopar front suspension was a better design than any of the other big 3.
When I say the geometry is better than a Mustang II front end I am refering to undesirable changes in camber and bump steer as the suspension moves through it's travel. The Mustang II front end has short control arms and spindles which results in a lot of chamber change which does not allow the contact patch of the tire to remain flat with the road reducing the handling capability.
Tubular control arms do not make a front end a Mustang II front end. The Mustang II used stamped arms just like mopar the aftermarket Mustang II front ends quite often include tubular control arms. Aftermarket control arms are available for most all popular cars and they are either the stock geometry or have improved designs that correct inherent design issuses and/or add in more adjustability.
In general most aftermarket tubular control arms are lighter and stiffer than the stock stamped arms but the long term durability is not as good. You can get the same stiffness in your stock arms by boxing them but that adds more weight to an already heavy part but they will be bullet proof.
So there are lots of true upgrades that will make for an improved front suspension for your mopar but if it's based on the Mustang II geometry you are taking a step backwards in handling capability.