I ran a street/strip '71 340 Cuda back in 1987, was totally stock suspension, all I added was a snubber and modified it to have 1/2" clearance, longer rear spring hangers to let the axle move downwards (sliders today), clamped the front segments and that car had daylight under the tyres every run footbraking with a 4200 verter, it ran a best of 11.00@122 with a 1.50 short time....old stuff worked then and it will today.....cost approx $40!!!!