What the tail shaft?

This stuff all came with a car I bought a while back and I'm cleaning house of stuff I'm not going to use for it . It is an 833 but the shifter mount don't seem right. Have any of you seen this before or did someone do a hack job? I'm also having issues IDing any #'s from it but brewer's lists the side cover as 64-70. I don't want to misrepresent anything when I list it in the for sale section. Thanks in advance and I'll try to get a good pic of the vin # and post it.

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