KSZR, To add to what Jonny said, by keeping the rear end on a GM A-body lower, you improve the "instant center" geometry between the lower and upper control arms, where the imaginary lines drawn parallel to the upper/lower arms should intersect as close to the rear of the car as possible, ideally closer than the midpoint of the wheelbase. This helps to plant the rear end (causes lift) and control wheel hop more effectively. A rear sway bar doesn't hurt traction on lower hp cars, so keep it. The non-boxed lower arms are OK too if you added sleeves for the bolts to run through to prevent crushing the arms when tightening the nuts. I did the same thing to my '70 Tempest and just sleeved the control arms.
Dennis
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