It may be too stiff, it might not be... I won't know until it's together and I'm driving it.
I'll post a full testimonial in June when I get back from driving it from Rochester, MN to Nashville, TN with the wife for our honeymoon. A little vibration might be a good thing
I will be running solid bushings in front with 700# springs and a small (if any) sway bar, and spherical bearings in the rear with 175# springs and no sway-bar. I'm currently driving on stock springs with big sway-bars and it handles OK, but not great. The ride way too stiff in the rear from the poly-bushings in the quadra-bind C4L. I'm actually anticipating a smoother feel, the bumps will feel sharper, but not as big.