A stabilizer or sway bar will more or less link the action of the two sides of the rear axle as much as the bushings and the strength of the bar itself and attachment points etc. allow for a given load. This also for cornering (or isolated bumps on either side) will about double the spring rate as both sides will have to compress. In other words, you can still get independent action but it takes a lot more load on one side or another to do it. A rear bar also tends to loosen up the rear for a more bias for less under and more oversteer. For drag racing a longer ladder setup would I think be preferable but others who have done it would be best source of info. For cornering, I like the panhard bar (trackbar) setup but am not really familiar yet with the setup on most of the Cobra relicas. I know on a mustang road race car my team had the 4 link setup would get a heavy side load and then "bind" at the bushings and the suspension became nearly locked. Hit a bump in mid corner and your rear end becomes your front end...don't ask me how I know that
