The car is 2650 50/50 .rf 670 lf 680, rr676 lr674 . cross weight is also 50/50 and I have many ways to adjust weight.I will race this car in no box gas classes ,and super pro with box, may try 10.90 ss stuff.This car will be set up not to wheestand, just another boring kill the tree and run the number stuff. So my question is what has worked best for heads up racing,a stiffer spring,. This will be my first four link car so I will be in a learning curve, hopefully out within a month. Any advise you can offer will be appreciated ,thanks Mike