Heidt's Hot Rod Shop has what your looking for, check out the web sight. Suspension, big brakes all good stuff. The lower arms with the Carrera coil over are the way to go if you have a 1974 and up chassis, wont get the 71-73 chassis much lower than stock account the spring heights are diffrent. Carrera has springs that fit the 5in top frame and then taper to the 2.5 coil over adjuster in rates that you guys with v-8"s will need.