[Farmall] Antifreeze in Oil

[ebony51 at frontiernet.net]

I went to change the oil in my dad's 1952 Super C I got back three years ago.  I ran it about 10 minutes to warm it up. When I went to drain the engine oil, about a pint of antifreeze came out first.  Cannot be good news. I suppose it could range from a crack in block to maybe a bad gasket.  

Any recommendations what I might look at first, etc. and what I can do to salvage the tractor.

Thanks in advance

Larry Hardesty