I did some measuring and the springs hbc sells for a small block are not z springs! My car is almost 3 inches higher than it should be. I kid you not it looks like the engine is out. From what i have found, i need the moog part 6803. Of course i have a show in my home town town at our fair and i hope we get rain so i can leave it home. Really disgusted with hbc after they talked me out of an nos set they hadz and then sold me these. The set they have is 6312, and its not even the 2nd choice for a z