It's not really necessary for lateral stability, as the axle really can't go anywhere with the UCA angles as they are. It would help lower the rear Roll Center Height, which is too high on the stock rear, but that's not really going to help much until you have the rest of the setup sorted out.
I'd suggest losing the Hotchkis rear arms, and get some with spherical bearings to allow articulation, and eliminate most of the bind... such as Edelbrock's uppers, and Currie's lowers.
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