Morning,
Got a buddy with 1965 413/727 Imperial. told the pushbutton set-up on the 1965 was a one year only deal.

No pushbuttons in '65, only column or console shifters. In either case the procedure is as follows:

Remove the lock screw from the cable adjustment wheel and back the wheel off several turns.

1. Have an assistant hold the selector lever firmly in the "1" (Low) position.

2. Hold the control cable centered in its bore in the transmission case, and pull outward on the cable with about two pounds of force to bottom the manual lever in the "Low" detent.

3. While maintaining this pull on the cable, rotate the adjustment wheel clockwise until it just contacts the case squarely.

4. Turn the wheel counterclockwise just enough to make the nearest hole in the wheel line up with the screw hole in the case.

5. Counting this hole as number one, continue turning the wheel counterclockwise until the fifth hole lines up with the screw hole in the case.

6. Push the cable in toward the transmission until the adjustment wheel is tight against the case and install the lock screw, tightening to 75 inch-pounds torque.