Dear SVT Engineer, going witha new tubular K member, with the Ford Boss 363 engine in a 89 Mustang Coupe. So will be saving some weight as well as adding some horsepower fun. The question I have is that this car is used for both track road racing fun events and is driven on the streets . Will be using yellow Koni struts and shocks. What is the best spring rate for my application? I need to spec when I order at the time of the K member order. Thanks