1960 Valiant- road race torsion bars

My bad, A body torsion bars are 35.8”, not 37.5”. “My bad.” 1960 Valiant are the same length so as numerous folks pointed out you can swap A body torsion bars in. Thanks for help.
As Bill Crowell points out, too stiff a car reduces traction and impedes handling and may upset balance front to rear.
I am currently digging into this subject where spring rates are a determined from application and vehicle mass. I did find a site with spring rates posted on torsion bars. Summit offers Hotchkiss Leaf springs 130#/in and 1 in lower.
Once I discover how discover how to calculate what I need, I will share the how to.