If your determined to use the parts on hand, by all means use the ,.92 Hemi bars. However, my preference for a street car would be to use .96 for small blocks or 1.0 for big blocks. XV actually specs out 1.12 to 1.16 for their packages, but they also have shocks to match, which is a key part of getting good road feel out of those bigger rates. Off the shelf gabriel/monroe gas shocks will be at their limit of control with .96 and 1.0 bars. Anything beyond that would require a step up in dampers.
Cornering performance is somewhat subjective at times, but I fully expect my old Challenger to out corner a ricer. Steps up in t-bar and s-bar rates, low profile tires, low profile stance, and a modern, radial tire compatible alignment will transform the way your old car feels. Consider this, most old cars would pull a .75 on the skid pad in their original form, most new sedans pull a high .8. A performance sedan may be around .95 The XV level 1 kit with lightweight wheels and new rubber will pull a sustained 1.02. That shows there is still a lot of capability left in these old pieces of iron and Mother's 40 year old design was/is actually pretty good in terms of performance.
