I will second the roto-joint/johnny joint option as a way to reduce bind and to increase articulation on road race /autoX designed suspensions,but If I'm not mistaken the 4link suspension you are currently using already uses heim joints(or as some would call them)rod ends.The bind issues you will run into are a result of the design of the suspension itself.It was designed to put the most traction to the ground in a straight line and lend itself to some adjustability for different track conditions among other things.It was never designed to work well around corners and in directional transitions.You may be able to use some of your brackets and /or shock mounts ,but it is very likely that it will have to be repositioned on your rearend housing as you have narrowed the rearend by the looks of the pics.You'll likely have to do a lot of looking for places where the two different styles of suspension have an impact on such as was said previously.
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