I just completed my spring project, which started out to replace the rear leaf springs, which were 20 + years old. Then I started researching, and in the end installed a Fays2 Watts Link, TCP Torque Arm, and Flex Form composite leaf springs. I also replaced my wheels and tires, and upgraded the exhaust to 3" from the headers through the mufflers, reduced to 2.5" to clear the watts link (while welding around the exhaust, I figured now was the time). What an amazing difference. The car is unbelievably stable in corners now, and doesn't rub tires anywhere, though they barely clear everywhere, with 275/40/17 on 9.5" wheels in the rear, and 225/50/16 on 8" wheels in the front (Toyo Proxes R888 autocross tires). I redid the front suspension a couple years back, and really didn't notice a huge difference, but this time, it is night and day. With the watts link, the rear axle just doesn't move laterally entering and exiting corners. The torque arm virtually eliminated brake dive and nose lift. The combination just makes the car so stable no matter what you're doing. I already had Global West sub frames on the car, so fabricated a custom removable brace to tie the torque arm to the sub frames. The watts link had absolutely no negatives - other than cost. The low roll center created by the watts link also virtually eliminated body roll. I like the composite leaf springs, but they are somewhat stiffer riding, though smoother, if that makes sense. Cost wasn't much more than the better steel leaf springs, though it took a while to get them. The torque arm contributed a little further to a bouncy ride, but the difference in vertical stability (and extra traction) is well worth it to me. It no longer drives like a 60's muscle car. Below is a picture.