Be careful as many of those old 2 bottom plows have been sprung. When looking at the plow from the rear make sure both of the bottoms lay on the floor the same and all of their angles are parallel. If one of the bottoms is sprung, you will never get it to work right.
I agree totally with this. I bought an old Ford 2 bottom w/o any trip protection and promptly broke it. Repaired all the broken bolts and then broke it a second time and it appears I slightly bent the main "J" shaped frame and the bottoms now seem slightly out of parallel. Want to buy it?? Just kidding but I learned an expensive lesson.
First, don't buy a plow w/o trip protection, unless your soil is rock free and soft. Find one with available parts, such as a Ford or Deere, but even then, some parts (such as landsides) are hard to find. Match you tractor size to the plow. I made the mistake of using too big a tractor on too small a plow without protection, and paid the price. I bought another old Ford 3 bottom with shear pins, restored it with new shares and shins, and it works great. But I pop the shear bolts frequently, but that is an easy cheap fix.
I see many online, if you are willing to travel, and in S.C., I occasionally see them locally. Look at your state Farm Bureau newletter, or E-Bay. There are not many new manufacturers of plows, and you can find an old one much less than the $800 a new two bottom costs. I see them often for $300 to $400. Be patient in your search and you will eventually find one to restore. When you do, I can help you find sources of parts, as I spent lots of hours searching for various parts for the two plows I restored and learned a lot.