Shimming Engine for Header Clearance

I had to insert a 1/4 shim under the drivers side biscuit mount on my big block to get the engine height and centering right. The saddles on the k frame are on a 45 degree angle, so as you shim one side to move it over, you slide the mount up the other saddle. Just make sure the engine is level side to side when you are done. By the way, I have never experienced any vibration issues, and I race mine.