72: Glad to hear you like the 1.12 bars, I have a pair stashed for when my project gets that far, but have been wondering if I went too big. I have the full Hotchkis kit to pair with them & the US Car Tool stiffening kit.
I don't think they're too big at all. The most important thing is making sure you run a set of shocks that was meant for that kind of wheel rate. Like I've said before, I think the Bilstein RCD's are the minimum for 1.06" bars or larger. The Hotchkis Fox shocks I run were still a noticeable improvement over the RCD's, which I ran for a bit with the 1.12" bars. I also run 18" rims, so there isn't much sidewall to absorb the bumps either.
I run Helwig sway bars front and rear, and have the car set up with subframe connectors, "J" bars (firewall to front frame rail with the shock towers tied in), a tubular radiator support brace and torque boxes on my car. All of the chassis work is in my build thread, link is in my signature. So the chassis is fairly stiff as well, but the ride quality is still tolerable. More on par with modern performance cars than an old musclecar though.