Best ifs kit? rms, hdk, gt suspension, or magnum force?

thread jack: speaking of aftermarket front ends, does anyone know what coil over spring rates would be best for a street driven big block? mine rides like a 10,000 pound dumptruck, unloaded!

I find that a longer shock /spring combo relieves some of the harshness.

Example....when I had a coil over combo with 10" springs, it took 400 lb. When I switched to the 12" combo (with more travel) I was able to go to 350 lb.....and a noticeable difference in ride.

A good way to tell if the spring you are using with the coil over you currently have is the right one...measure it at installed height. According to Qa1, the spring should collapse approx 25% to 33% regardless of spring length.....if it is collapsing too much, the spring is too weak....if it is not collapsing enough, the spring is too stiff.

JMHO...no charts or SWAG calculator. ...just experience and seat of the pants feel.