64 dart shock upgrade

Nope. Bad idea, just like air shocks to raise the ride height.

The shock mounts aren’t designed to carry spring load. If you need stiffer springs, install stiffer springs.
actually it doesnt, keeps the height leveled when i got a bunch of stuff in the trunk rides nice,
i have also had air shocks they do not compare at all air shocks are really stiff the car rides too hard. These ride great they are not stiff, just a little more stiff than the regular stock shocks.