Will a mid 1960s 727 tailpiece bolt onto a mid 1970s 727?

Greetings My Wise Elder Moparians!

I'm starting to figure out the most cost effective path to upgrading a worn 383/727 to a rebuilt 400 with the 727 meant to run with it. Without getting Down in the Dirt with these machines, yet, I wonder if the tail piece from the older, 1965/66 transmission will bolt onto the 1977 trans. If so, that likely will be the path I take to upgrading the drive train. I want to get this good old motor and tranny out NOW, before heat and city traffic destroy it...

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