Mystery trans, pls help ID

Has the Mopar speedo arrangement
I don't know if the bolt pattern on the trans is common, don't understand the bar coming off the case, by the shift levers,
No part number, only casting numbers
I have never seen a Mopar trans that was a top loader (plate on top of case)
the twisted "N" the trans is probably a trademark ??
My racing buddy said that he thinks that maybe it's out of his 65 Belvedere
Casting dates are 1965-66

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