Nobody has commented on how a 7/8" bar is probably way too much for the rear?
What size is the front bar?
The rear bar should really be used as a tuning aid. When the rear bar is too big, the car will want to spin out. That tendency gets worse the faster you drive. I had an axle mounted 7/8" ADDCO bar on Ginger and it was exactly like that. I had a 1 1/4" front bar, 1.0 torsion bars, MP XHD leafs and at that time, KYB shocks.
I mixed it up a bit to get it to perform in a neutral manner. Bigger 1.15 torsion bars, Bilstein shocks and a switch to a 3/4" frame mounted rear bar.
Much better.
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