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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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