Pro Touring 10K

You need the springs to be close to zero arch, with the car assembled and at full weight ready to race. Otherwise your playing a guessing game on ride hight. And........ as I opined earlier, 200 LB per inch is way to much rate.......You really should be somewhere in the 140-150 lb area, depending on your F/R weight distribution and corner weights. Your fab work looks awesome by the way, very nice!