Landrum/Calvert monoleaf question

[40Coupe]

Originally Posted by SmallBlockNova

I have a '71 Nova street strip car, runs mid 11's, and 60 foots in the mid 1.50s. The car has Cal Tracs, and Landrum 175# monoleaf springs in the back. The 175# rear springs are rated for a 2750-3100 lb. car, but mine weighs 3400 race ready. Is this a problem? The car works well, but I'm worried about breaking a spring. It twists a little bit at launch, but I'm not sure if this is due to my leaf springs moved closer together (minitub) or because my springs are too light. Should I switch to Calvert split 200# springs or will I be fine? Thanks.

I'm running the Calvert 200 lb units on my '67. The rear of the car weighs 1450 lb.