I too thought I had a "lifter noise" issue, but much to my surprise I found it was the V8 engine cover sitting on the passenger side valve cover due to a broken engine cover hook on the driver's side by the firewall.
I could hear the "lifter noise" and make it go away by lifting/pushing on the front passenger side of the engine cover.
I made a temporary repair to the engine cover to make it sit correctly while I'm waiting for my painted engine cover.
It's worth a shot to see if your noise is similar to mine.
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