I have a 65 Barracuda an I am not sure that would work. If you look at the underside the floor shifter angled both front and rear of the shifter. Also with the floor shifter it has to be moved left and right and the shifter indicator is right on the shifter. The other thing I see is that there is about 2 inches from the shifter exit and the shifter body. You would need to find something to attach to the shifter to hold it in place. This is all off my experience with a 65 floor shifter.
What I would do is find some plastic brush like you see on an escalator and use the screw from the shift indicator to hold it in place.