It's a helical LSD, no need for figure 8's
As far as driving the car on twisties, I've only driven it from Mark's house to home, then to work and back today. I got on it going around a couple tight 90* corners, and the rear end still steps out nicely, and feels more planted than with the welded diff since the helical LSD transfers more torque to the wheel with more grip.
I thought about just finding a whole different rear end, but the only one I knew of at the time that was available was way up in East Bethel at u-pull it, and that would have been out of a '91. I figured it was easier to just cut this one out than go lay in a puddle of mud trying to pull the one up there.