Here is a used factory original Muncie 4-speed input shaft, part number AWT297-16A. The shaft has 24 teeth and 10 splines. It is a 2:56 wide ratio. Original in 1963 to 1965 Chevrolet with the Muncie M20 transmission. The input shaft has no groves. The shaft sat in the basement for 50 years and does have some rust, see photos. Synchro-engaging teeth show wear. Gear shows rust pitting all over, but is not detrimental to usage see photos.
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It can be picked up at
428 Grasslands Rd.
Valhalla N.Y. 10595
I can ship it if you like. Call or email me your state and Zip code for shipping charges. Ask for George.