Yeah I had one. I think it was the only year for push button and slip yoke together. I still have the valve body. Stripped the rest out for parts. Its one of those things nobody wants until that one guy is looking for one.
My issue is that I have two good 1964 ball and trunnion pushbutton 727s, but that means I have to figure out how to have a suspension shop splice in a ball and trunnion into my driveshaft. I thought of swapping in a 1965 pushbutton slip-yoke output shaft and housing, if I can find one, but I'm told they will not interchange with 1962 - 1964 727s. I don't know about that since they are all dual pumps. I guess that might be worth a thread. At the end of the day, it might be easier and cheaper to a shop splice in the ball and trunnion and locate a proper front flange.