I have the stiffer rate Torsion bars in my 68 Barracuda than the Green Challenger if it’s got hotchkis torsion bars. I drive mine on street. Drive 51 miles to track and back.
1.10 Hotchkis torsion bar E-body wheel rate: ~240 #/in
1.12 MP torsion bar E-body wheel rate: 250 #/in
1.14” MP torsion bar A-body wheel rate: 350 #/in
the stiffest e-body torsion bar is a 1.24” that has a rate of about 370 #/in
