It will depend on which year, and whether it is manual or automatic.
318 Auto transmission has a filler plug located on the side of the transmission.
there is none, it uses the same one in front
assuming the fluid wasn't low when changed, approx 4 quarts. add almost 4 then check the level.
3 quarts = 96 fluid ounces.
96 oz 1 quart = 32 oz 1 oz = 0.03 qt 1 Imp. qt = 40 oz