Nope...you'll be fine...Check the "points" (that's what we used to call them...actually the "shares") to make sure they are sharp/new or at least in good shape...I don't know anything about the Leinbach plows..as we only had Dearborns and Fords...BobG in VA
PS: a good rule of thumb is one inch of plow per one horsepower of tractor....BobG
Measure from the outside edge of the "landside" to the outer tip edge of the "Wing of Share". See attached photo, please disregard any spelling error on "landside" this was draw by mouse freehand. This is the width of the furrow for your tractor tire. Hope this helps.
In regards to size, think of all the plow together. I.e., 2x16 plow is cutting 32" of soil with each pass. 3x14 plow is cutting 42". 2x18 plow is cutting 36". Your tractor will easily pull a 3x16 which is cutting 48". It would pull a 4x14 which is cutting 56" is Missouri soil.