Well, the old worn out formula: 0.5*(3*14)+0.25*14=24.5 inches from furrow wall to point of draft (assuming you have a 14" plow). You cant get your tractor down to 49" inside to inside the rear tractor wheels without switching wheels side to side. I think you can get down to 56-58" if you slide them in all the way. You can't get the center of pull to line up with the center of draft on the plow like everyone says, and that's OK. But you do need to draw an imaginary line from the center of pull to the center of draft and make the clevis fall on that line. The diagram someone posted showing a two bottom makes this clear. The manual calls this "dividing the side draft" or some junk like that.
The way to diagnose this is if the front of the tractor pulls to the right, you need to move the clevis to the left, and if the front of the tractor pulls to the left, you need to move the clevis to the right. And you need to do this while getting the front bottom to cut the correct width also.
I usually set my front tractor wheels out an inch or two wider than the rear, so in your case with the rears at 56" inside to inside, you could set the front up at 58" inside to inside, or at least 24" from the inside of the right wheel to the center of the tractor. The rear wheel always drifts away from the furrow wall.
You could do all the measuring and eyballing in the world, but you'll just have to wait until you're in the field to adjust some things. And make sure all your adjustments are free and not rusted up.
Setting coulters is also related to your question. The procedure goes: set the rear coulter for a clean furrow wall (once you start plowing), set the 2nd coulter so the rear bottom takes the correct width (I assume 14"), then set the front coulter so the 2nd bottom is taking 14". Then you look at the hitch again and set the hitch so the front bottom is taking 14".
And one last thing, if your plow pops out and starts to pull to the left (to the unplowed ground), the problem is never your horizontal hitch setting, if you set it right to begin with. Everyone automatically starts monkeying with the hitch and moving it to the right. The problem can usually be sourced to improper vertical hitch (too high on the plow), dull plow shares, or worn landsides.
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