starter grinding

Patient::: 74 360 block and '66 904 automatic bellhousing with early 904 (small hub) converter with B+M weighted flexplate ...on engine run stand. I cannot stop the starter from grinding. I have tried several starters to no avail. Is the tin spacer/cover required for proper starter/converter alignment?

View attachment 1716276720

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Aluminum piece is not mandatory.
Where are the teeth on the converter rashed?
That can tell us a lot.
Pictures of the teeth close, and maybe a couple of different angles and in focus.