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Obviously not what you want to hear on a rebuild.
There are many sources of noise. Could still be tensioners. That rattly sound seems like poor operating tensioners
My experience was rattly sounds after first 30 miles. Pulled engine and replaced one tensioner.
Also looked at the cam sprockets and changed the number of shims to better align the whole chain path to the intermediate sprockets.
Sounds disappeared. 15,000 miles later. Still no sounds.
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