My 70 Charger has 1.15” torsion bars, the car weighs 3900. It rides about like the Wife’s 2015 Challenger.
Bilstein shocks really do help.
Skinny torsion bars allow too much lift and side in the front no matter the shocks you have. The car feels like a boat on a wavy lake with small torsion bars. I had stock .88” in another Charger. A couple months back I swapped in 1.03s from PST. it has crappy KYB shocks, a piss poor shock for most cars but I had the shocks here already and this car is far from finished…
The increase in torsion bar size made the car feel stable and more easy to handle.