Torsion bar size effect

MY son's Barracuda had .990" bars with homebuilt rear springs and KYB shocks. It was pretty stiff, but not objectionably. The first sway bar we used was a factory big block a-body unit. Handling was excellent and predictable. We added a rear bar and larger front bar. Handling did improve. The next step was 1.14" bars. I never did drive it with the big bars, but my son said it wasn't bad. I don't think I'd buy torsion bars smaller than .920s.