Antifreeze in oil pan Farmall M

I just drained a little over 2 gallons of antifreeze out my M,s oil pan. Tractor has been sitting for atleast 5 years. The anitfreeze that came out was bright green so i don"t think it froze. Pulled the oil pan off and looked up into the crank case. I didn"t see how it got in there. So I filled cooling system back up with water and pressure tested and still did not find any leaks into the crank case. I would think the leak must be low in the water jacket to get over 2 gallons in the oil pan. Any ideas?
 
Wish I could but the engine is locked up in cyl 3 and 4. (rusty bores) And if the head gasket or cyl head was bad it should have showed up in the press check (spark plugs where out)And the pressure test held pressure for a hour (14 psi) I would like to save the the engine thats in the tractor. But if its a cracked block its junk. If its junk I have engine out of a IH 305 combine, 303 ci 6 cly that runs great that I can make work with some fab work. I just don't want to waste my time tearing down the stock engine and sending it it for magnaflux to find out its scrap.
 

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