Suginami pretty well summed it up. Considering the mileage and your comment about regular oil changes, I don't think I'd do the chain yet. I would suggest replacing the two rails on the left bank. The inner rail breaks off and rides the cam gear up which causes valve timing to jump and bends the valves on the left bank only. Hoses and V belts almost never break anymore being of technological advances in materials. Perhaps they are making better rails now.
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