After installing the desired bushing, you need to choose the timing ramp you want to use. See the link above for the choices. These different ramps are set by using different combination of springs.So hear me out....if i need total timming to be 22 degrees, i can put the 18 degree bushing in my distributer, then set my timming to 4 BTC. Does that sound right? Or am i way off on this understanding?