This video certainly sounds similar to yours. It's not unheard of for a new part to be bad right off the shelf, so maybe you just got a bad rebuilt tensioner?....that is.....provided you remembered to pull the pin from the one you installed when you finally got all your timing marks lined up after 25 times.
https://www.youtube.com/watch?v=p0H4_v14iQc
With timing cover partially removed.
https://www.youtube.com/watch?v=GA1NJ8DVm_U
With tensioner replaced. (Last 15 seconds of video)
https://www.youtube.com/watch?v=C8CHNfEzskU
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