May not apply, but....
Oldmanmopar pointed out that there are two kick down levers that mount on the 904.
One is 4bbl specific and the other is 2bbl specific. He mentioned that a 2bbl lever could be modified by drilling a hole closer to the centerline of the trans shaft. I don't know the dimensions.
The hole being closer would change the rate the lever moves compared to the throttle lever.
