Your original motor should have part number 3431665.
Position the switch plate on your new motor to the location shown in the diagram below for a 3431077 motor.
The switch plate is the large black cap plate on the housing where the wires are soldered.
You will see a tooth on the plate at about the 10 o'clock position.
Use your original crank arm.
Check wiring length and plug.
Make sure your wiring is in the same slots as your original motor.
If you have any problems call me.
450-656-5438

Jules