Bigger torsion bars are pretty much a "must do" as far as I'm concerned. Sway bars will help some, but our old mopars were
drastically undersprung from the factory in the front. The .94 bars sound like a good option, it doesn't take much diameter change with the torsion bars to result in a big difference. But you could also go a size larger without any problems.
For some reference, I went up to 1.12" bars on my Challenger, vs. the stock .88" bars (this is a HUGE increase in spring rate, from ~100 lbs to 270!). The handling is VERY much improved, even without sway bars. And although I prefer a stiffer ride with my vehicles, I wouldn't say its harsh at all. The only thing to consider with the larger torsion bars is the ride height adjustment, with 1.12" bars I ran out of adjustment on my torsion bar adjusters at stock ride height, couldn't go any lower than that (which is why I now have 2" drop spindles).
For a small block A-body though I would think that Firm Feels .94" or 1.0" bar would be great on the street, depending on what you were looking for. Even the 1.0" bar should leave plenty of adjustability to get lower than stock ride height if your car is lowered a little. Just Suspension also sells a 1" torsion bar for around the same price, I think JS lists theirs at $250, FFI lists theirs at $285. Larger than a 1" bar would probably begin to invite adjustability issues, and the ride would start to be pretty stiff.
If you look at FFI
http://www.firmfeel.com/torsionb_a.htm they list the spring rates with the size of the bar, so you get an idea of how much of a change you're looking at.
