Are these torsion bars gonna be too big for me?

I'm looking to upgrade my handling in my street-driven '68 Dart. Just looking to make it corner with a little less body roll, stiffen up the ride a bit. A while back I bought a set of 1.03" Hotchkis torsion bars...and I guess now I'm wondering if these are gonna be too stiff for my car, being a /6 and all. Thoughts?
I did the same thing to mine and seemed thoses were too stiff. I'm going back to the one's just under 1.0.