My "new" '74 Duster- or why I need a project like a hole in the head

I think the 1.06" FFI bars would be a good choice for what you're going to be doing, especially with the Fox shocks.

I was surprised just how soft the Just Suspension 1" bars were. Don't get me wrong, they're a huge step up from stock V8 bars, but not even close to what I was looking for. Even with the 1" bars there was still a decent amount of body roll (no sway bars at that point). Bilsteins worked fine, but there just wasn't enough spring rate for me.

The 1.12" bars with Bilsteins was a big improvement in both handling and ride quality as far as I'm concerned. Keep in mind at that point I was still running 225/60/15's. Handling was very much improved, car was pretty flat in the corners even without sway bars, and the ride was pretty good. Pretty comparable to my g/f's 2013 premium package Mustang. Not harsh, but a pretty firm ride.

The 1.12" bars with Fox shocks and the 18's were another big step up in handling, mostly because of the huge increase in tire size. I actually got some body roll back in harder cornering because of the extra grip. The ride got a little firmer, probably because of the shortened sidewalls. I still wouldn't say its a harsh ride, but there's definitely a lot of road feel, and not a lot of cushion. I also added in my sway bars finally, which took away the bit of body roll that I was starting to get, especially in the back where I went with a 7/8" E-body bar. I have Hellwig's 1 1/8" hollow bar up front (55905), but went with the larger E body bar in back (6908).

Honestly, I think if your primary use is going to be the street you'll be fine with 1.06" bars. I like how my car rides with the 1.12" bars, but I can definitely see how I might get tired of it by the end of a long trip. Don't get me wrong, I don't regret putting the 1.12" bars on my Duster, I think they fit the build pretty well. But I also don't plan on using them on my other A-bodies. My Duster definitely isn't my "long trip" car, what with the manual steering, manual brakes, no A/C, and fairly horrible gas mileage. But I have a few Mopars, and my EL5 GT will not be getting 1.12" bars. Just like its keeping its power steering, possibly its A/C, etc.

As far as heavy, I actually have a fully cast iron 833 on my Duster. It does have an aluminum bell and manual everything though, and will eventually have '71 doors and a '71 Dart front end.