Well that escalated quickly

Are you sure you have a 833 four speed? The picture shows a 3-speed overdrive shifter. Can you post a clear picture of the raised pad on the passenger side of the main case?
I also noticed the same on the handle knob.. at least the number on the linkage rod case can be seen. Looks like a C95664 which is a 64-70 side cover at least. I’ll have more info tomorrow. Could have just had the shifter swapped for that application. Uploading photos kinda dumbs down the resolution so it’s probably even harder to read with the uploaded photo.

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