So I have run into a slight problem with my early style 289. The harmonic balancer I bought doesn't clear my timing cover. I bought it before I knew how different this engine could be to the later style 289. So I never thought to be so cautious of it, it fit the crankshaft so I was happy. So since I need to get a different harmonic balancer does this mean I will have to rip my engine apart to get my rotating assembly rebalanced?