727 for my 383 Dart Conversion Question..

Professor Fate said
'67 and earlier cranks had a smaller convertor register, which required a smaller nose on the torque convertor. I'm not sure about the 727s, but I know 904s also had a different input & spline in those years which would not allow swapping convertors between the two age brackets- I would suspect a similar situation with the 727.
In other words, I believe what you're looking for would be a '66-'67 727 to mate to your '65 383.
If I'm incorrect in my assumption I'm sure someone will pipe up!
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Only thing I’ll add is that the 67 transmissions, at least the small block 727, had a so called mid year change. I have an original to my vehicle 67 and it takes the same converter as a 68-up. Might just be for the small block 727, the big block 727 maybe someone can clarify if there to was a mid year change?