I am running the 943 comp springs and have 600 miles on them so far at .700 lift. Just had my Indy heads machined for spring locators and when we checked the springs all were same as new. K-motion told me direct not to run the K-950s on the street, they will break. I have a set of 9385 Iskys I will try if the comps go down, Isky says they will hold up on the street also. I have 600 miles on Indy bronze dist gear and shaft. It shows slight amount of wear. Galen