Replacing the sleeve orings is a good idea while you are in there. You can check the ring end gaps, the ring lands, and the skirt clearance, if all are in spec go back together with them or replace the rings and hone it.
But the bent pushrods are a mystery. Has the tractor been stored for a long time? Stuck valves are almost always the reason for bent pushrods. It looks like one of the adjuster screws is worn away too??? Possibly that was caused from a bent pushrod.
I don't see evidence of lack of oiling though. Usually loss of oil results in the rocker shaft and bushings burning up long before the valve stems loose oil.
You may want to disassemble the rockers completely. The clearance specs on the shaft bushings is very tight, few will be in tolerance. A reconditioned rocker assy may be in order. You can buy the components to DIY, but the bushings have to be honed to size. Be sure the cork plugs are in place in the ends.
But while the head is off, and you are considering going into the bottom end, roll the rear main bearing out, be sure it has not spun. That is where the rocker shaft gets a metered oil supply, through the hole in the top half of the rear main bearing. You can also blow down through the oil galley while the bearing is out to be sure it is clear. Sometimes if someone used gasket sealer on the head gasket it will clog the oil galley to the rockers.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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