Looking at Tubular K member

AJE is basically drag race only stuff. It's not street suspension.

If you're going to do a coil over conversion then RMS and HDK are the best options. They have well thought out assemblies that address some of the issues that occur when you install suspension on a chassis that was designed to carry the loads differently with its original suspension. That's not a minor thing, coil over and torsion bars load the chassis in very different ways. The torsion bar suspension carries all of the suspension load in the K frame and the torsion bar crossmember. A coil over suspension puts all the load directly on the frame rails and coil over mounts (which should NOT be the shock mounts on a Mopar, since they were never intended to carry the weight of the car. Just the resistance from the shocks). Because of the way that the torsion bar suspension loads the chassis and the way the Mopar unibody was designed they're already not reinforced very well between the frame rails and firewall, which is why adding shock tower braces and triangulating the front rails and firewall is so common for stiffening the chassis already. The coil over conversions add more stress to that area, which was already somewhat weak.

What is the intended use of the car? Because with the proper upgrades to the torsion bar suspension you can get your car to handle just as well as with a coil over conversion for significantly less money. All the coil over conversions do that can't be accomplished with the torsion bars is a rack and pinion and header room. But really a rack and pinion isn't a performance upgrade, just a change in feel. And there are good headers that fit with torsion bars.