All of my DCs with eagle hitch have leakage in the hyd system and will not hold a hyd load at any position.
My two BER plows, made for the eagle hitch, each have a gage wheel for depth control. I have to rely on the gage wheel for depth control. I will be surprised if your DC4 can plow good without a gage wheel on the plow.
The eagle hitch has no swing feature which greatly aids steering the tractor. The BER Case plows have that feature built into the plow. The eagle hitch does not match Category 2 and may not hook to a Category 1 plow. Your two bottom Ford plow may be Category 1.
Good luck with your endeavor.