From the pics I can see it looks like the bolt that holds the balance shaft gear is beat up as well. Since you are already spending money....might as well get all the seals. Cam, Crank, and both balance shaft seals. All that oil down there came from somewhere.....most likely from the shaft seals which have never been replaced. If the seals continue leaking, they will ruin the new belts. Then again, might as well just install the belts for now and make sure you did not bend valves. The service info I have on this motor warns not to turn the cam or crank with the belt off, this would indicate that it is an interferance engine, yet I have seen quite a few instances where the valves went untouched. Various circumstances control this such as rpm at the time of failure or how far the belt jumped timing.