I have some , either exhaust gasket, or maybe rocker arm noise, or lifter noise. Clicking like the valves would be out of adjustment. However no noise during initital start, while cold, then the noise comes and remains same. I think the next step will be to peek into the valve train and see. I hope nothing major.
If it's worn rocker arms, the 380SE that I sometimes drive went from 140,000 to 196,000 miles with the same clicking symptoms. It recieved new lifters and rockers as part of a head rebuild that happened as a result of the T-chain jumping a few links.