slant six tranny swaps

so I have a 1974 Gold Duster original slant six auto I want to make it a 4 speed floor shift just to use as a daily driver. There is a 1964 or 1965 valiant slant six 3 on the tree at a junk yard near my house that I could easily use for parts. my question is which parts will fit and which parts wont I have an a 833 od 4 speed and the pedals i would like to use as much of this car as i can since it is very available to part out. also will i need to change the carb going from auto to manual? thank you