check with your local front end guy before you add springs. lifting up the suspension will affect the camber adjustment. i have gone through this with a 50' chevy truck with a 74' nova clip installed where truck sat to low and last owner installed taller springs to raise up truck causing too much + camber. adding taller springs causes the same effect as lifting your truck by front crossmember with a floor jack, pulling tops of upper a-arms outward and you can only remove so many shims to get back the adjustment.
