Don't try to press it off and on the rod, take it to a shop that has the proper set up.
You can get a better call on it once the head is removed.
A couple dangers in running it, the top ring land may be crimped down on the top ring. That will lead to seal failure, and cylinder wall damage.
The skirt may be cracked or collapsed. At best an annoying knock, at worst a rod through the block!
With the piston out the cylinder can be honed to remove any scratches. A few minor ones won't hurt. Deep though are a problem.
Once the head is off, you can check the valve seal bu laying the head on it's side, ex port up, fill the port with diesel or some thin liquid, look for leakage around the valve. Flip it over, check the intake. If leaking you can replace the valve, lap it in. Be sure the seat didn't get dinged. If it is, to the machine shop.
That engine came with a steel shim head gasket. Don't go back with that, use a composition gasket.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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