That 1/2" play at the bumper translates to a (guestimated) 2+" of movement at the wheel.

Daily driving with 1" torsionbars in my Dart gives a nice and well behaving setup for me. But with some spirited streetdriving I feel the car would benefit from more springrate.

Oh, my bumpstops bailed ship long ago but the setup is firm enough to prevent contact.