I recently purchased a 66 Chevelle. Sometimes when I crank the starter, I hear the solenoid click but the starter motor doesn't turn. I crank 3-5 times and it starts (and sounds good). Sometimes the starter won't turn at all...the solenoid just clicks forever. I tried shimming it thinking that would solve my problem. But now it whines before the engine finally turns over...which makes me think I have the starter shimmed too close to the flywheel. The flywheel shows proof of this now with slightly worn teeth. Anyone have advice?