my friend and i have two fergy disc plows, the bent tube MF 64 is more rare the straight tube plow is an older Ferguson.
we live about 15 miles apart and got tired of loading the plow up and moving it, as a disk plow is somewhat more unstabe, as it can roll around on those big disk. we ran across another one sitting in the fence row covered with vines and we bought it, so, no more loading and moving of disc plows for us.
I have enjoyed using the disc plow, the key to making a disc plow work and run straight is the condition of the rear coulter blade.
This blade is like the counter blance or guide for the plow. it must be in excellent shape and adjusted properly or the old plow will pull to the left side. I replaced the rear guide blade on both of our plows. I always use a stabilizer (chain) on the right side of the plow to insure the plow cannot go too far to the left and tear up my lift arms.
Good luck with the plow,
note to file: turn the plow over or lift it up and check the condition of those big roller bearing in each plow, if they are ruined that might be a deal breaker, all or ours were good.