I ran my ‘72 318 Challenger with 1.12” torsion bars for about 70k miles on the street, it’s a good size for handling without being too harsh for the street. You will want a good set of shocks though, I ran mine with KYB’s for quite awhile which was terrible, upgrading to RCD Bilstein’s was a massive improvement in ride quality. The 1.14’s would be pretty similar in wheel rate, they’d do better paired with a modern set of tires than with some skinny 15” all season radials.
I ran CAP and then Hotchkis tubular UCA’s on the Challenger. I run the SPC gen I’s on my Duster, they’re the better option than the Hotchkis UCA’s especially for the street because they’re bushed which holds up better. And they’re more adjustable and they’re adjustable on the car, which makes the alignment a lot easier.
