I used the UMI bar that mounts on the lower control arms.
3034 - 1978-1988 GM G-Body 1" Solid Rear Sway Bar for Improved Handling
Improve handling with the 3034 - 1978-1988 GM G-Body Sway Bar, Rear, Solid, 1". Reduce body roll, increase cornering capabilities, and maintain vehicle level
www.umiperformance.com
I believe you have to have aftermarket lowers to use this because It is too stiff to hookup to the stock stamped steel lowers. I wouldn't consider using the stock rear bar, it is very flimsy. The system that Scott referenced is another good option, but I ruled that out because of my fuel system setup - both fuel pumps sit about 4-5" behind the diff cover, the body mounted S10 Blazer bar would've made for an extremely crowded area.
I seen you posted earlier that you were having a tough time contacting UMI. It must be Corona related, they've always answered whenever I've called. Very knowledgeable people, and almost local to me with good prices and products. If you ever have the opportunity to see their Green Machine in action, then I'd recommend it - that car handles and it's all of their bolt on stuff.
Keep in mind though, I'm not saying anyone else's parts aren't as good, but the UMI stuff works based on my experience.
Good luck - Jim
