As mentioned the G Bar and G Link both work great with existing mini tub kits.
There is a Mopar E body G-Bar. While it doesn`t offer all of the adjustability of the G-Link it can be run with an adj. rate rear swaybar and is an impressive performer in it`s own right.
Torque arm systems can work quite well. Their overall format precludes them from having much antisquat and limits instant center location and SVSA length though which can make them one trick ponys. They can still hook hard in a straight line but it general requires the rest of the car to have a more hardcore drag set up than a comparable adj. 4 link car to run the same short times. These are generalizations of course but it`s one reason they aren`t more popular. One nice thing about them is it`s almost hard to build a bad one where it`s very easy to build a crappy 4 link, just ask the OEs...
Mark SC&C