Thanks Oliver90Owner. All 7 valve ports in the head are normal and dry except the exhaust port on the #4 cylinder. When it ran the rad never had time to pressurize as the coolant (so much that it couldn't all burn in the cylinder) came out the crack in the manifold and sprayed out the side.
I had the head magnefluxed but not pressure checked. They didn't find any cracks so that's why I am thinking it is the head face that is not straight.
As for the carriage, I knew it was done when I bought it and am not too worried. There are enough used dealers and farmers around to do something. If the tracks fall off, I can always bolt wheels on it and turn it into a tractor.
The engine however is driving me nuts. I'm at the point where I just want to find something to justify the coolant leak that seems to be limited to the #4 cylinder.