I've driven Mopars with a variety of arrangements...Small torsion bars with no sway bar, with one, large torsion bars with one, without one ...
I have a '70 Charger with the small .88 bras and a huge 1 1/4" sway bar, another 70 Charger of mine has 1.15" bars with a 1 1/4" hollow sway bar.
The big TB, big sway bar handles the best, of course.
The small TB, big sway bar corners well but feels soft due to the weak spring rate of the tiny .88 bars. I have a couple pair of 1.0" TBs to swap in, I just haven't made the swap yet.
A FBBO member here has a Coronet with .96 T bars and no sway bar. It seems to ride and handle fine, though when I drove it, I didn't push it like I do my own cars.
To utilize the sway bar, you need a manner to connect it to the lower control arms. If your car does not have the OEM style LCAs with the mounts, you can use links like these:
The ones on the right....the straight threaded part connects to the sway bar, the 90 degree angle section fits through a hole you drill in the lower control arm.
You can order them through
RockAuto.com
Good luck.