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The '325 designation on the case means it is either a '64 or '65 case. look at the input where it goes into the clutch. A Close ratio (2.20 low) will have a circumferental ring cut in the splined area. A wide ratio trans (2.56 low) has no groove in the splined area.
The numbers you have posted are the Main Casting number (3851325) and the Extension Housing Casing number (3857584) and are for the Muncie 4-Speed on the 1965 model. I can't tell you if it is wide ratio or close ratio from these numbers. I have read that none or only a very few M22 were used in 1965.
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