Looks like you got your work cut out for you. My project 1872 looked as bad or worse from the oil leaks. How far are you going with this one? Just do not let it turn into a while I am here I might as well fix this, things have a way of snowballing as I am sure you know. My 1872 rebuild started out as just fix it up so I could use it as a dedicated snow blower tractor and look at where it is today. Good luck with this one and stay warm.
Later
Tom