Super Stock Springs and 60' foots

I have my super stocks clamped. 3360lb dart 340 with a stick 29.5x9 and a 5.13 best 60' was 1.50 lots of times. 1.51 1.52 the last I ran it but the tires were just about shot. Clamping the front was worth .03's. I would say yours is working great.