Ferguson 2-12 what rear wheel spacing?

'50's era Ferguson 2-12 3pt plow. Tractor is Ford 3000 with 13.6 tires on 11" rims.
What should be my rear wheel spacing inside firewall to inside firewall?
Thanks!

Your right wheel will run in the furrow. The plow does not care what size tires and wheels you have.
Typically a tractor pulling a mounted plow had the tires as close together as settings allow.
With the tractor on level ground and the plow attached, the measurement from the first land side to the inside of the right tire should be about 12". If more than that you would have to run your furrow wheel away from the furrow wall.
With that size tractor I would think a 2x16 plow would be better suited. My opinion.

John's info is good. To see if it is set correctly, stop in the act of plowing, and use a garden trowel behind the wheel to dig out the right end of the share on the first moldboard. the tip of it should be close to the land side of the furrow, and as deep as the furrow. Jim

All Fergusons from the 20 series to the 135 series and all Fords from the first 9N to the last grey 4000 were planed on a 52" wheel tread for plowing no mater if a 2-12" plow or a 4-14" plow and your 3000 is in same class as all the earlier tractors so it should be the 52" wheel tread and that means 52" from center of left tire to center of right tire and tire size was not figured to change that so unless you have something like a 16.9 tire the size is not figured in the setting and a tire that size would be to wide for your plow for tire to fit in furrow. And all plows designed for those tractors were designed for that 52" wheel tread.

That was all good info. I looked in the operators manual, there is a setting for 52" tread (center to center).
Mine is currently set in the 56" position. However, when I measure it i get 57". So I guess my 11" odd rims are affecting the setup. Story on that is when I got the machine it had a 11" rim on one side and totally rotted 10" rim on the other. So I bought a new 11" rim. I digress.

My calculations show me needing to narrow up the tread, so at least we all all talking the same direction. This requires swapping rims side to side. My weak back is recovering from fertilizer bag hauling, so a little risky. They are not loaded.
What else? Check for fender clearance, check check chains, ensure arms don't hit tires....

When plowing, should I stay off the furrow wall with rear tire, or let it just kiss it? How about front tire?
Thanks.

If you can move your right front wheel in to run against the furrow wall for a 2x12 plow that would be the easiest way.

So after setting front and rear treads to the 52" position, it was time to try it out.

It worked fair to start, but after a few adjustments it started to look like a real farmer at work. Setting the plow to a depth of 6-7 inches was the best. I started with it too deep. It didn't look too deep, but then actually getting off my butt and measuring showed 9". Plowing in the wet areas was a mess, got to dry ground and it looked real good.
If I hugged the rear tire to the furrow wall, it cut at 12" wide with the front bottom. So I wonder about that, do we want the front bottom to cut through down there or leave a little bit of a "hinge" of dirt? I would think one way or the other would change the plowing/turning action.
I used the position control hydraulic setting, not the draft. I just figured the draft control probably doesn't even work correctly. However, I know that draft control was the big invention back then. I am not lacking for traction, so ehh.

Then the tractor slowed down and died. Diagnosis rust in the fuel tank clogged the nylon mesh strainer in the fuel tap. Typical for me and this Ford 3000. It restarted with out bleeding air from the system!

Tomorrow disc harrow time.