hi if the blocks ok rebuild what you got if you aren't planning on getting "divorced" from the old girl anytime soon. If another motors sat around you could find you get issues with the sealing rings again right away, or sometime further down the line. Unless you know somebody rebuilt the motor recently and did it properly.
I Got blue blood in my system as my family history is farming with the Dagenham Fordsons back in the Uk I remember the last one leaving the farm in about 1979 or so,and our family history is originally Essex to on my Dads side. I got a pile of Fordson Majors here in my collection in Canada. I'd bankrupt my self if I restored all of them to like new L.O.L. I got a last year 5000 diesel here we still use to cut grass with. I rebuilt the motor in it about 10 years ago though.Dad drives it and thinks about the good old days farming with them !.