For the swapping valves usually the intake is larger than the exhaust. For the seals most tractors didn't have any the clearance on the guides was the seal so to speak. There should be one or two groves in the stem at or near the end for the keepers to fit into when the spring is compressed to hold the spring on the valves. I would have thought the people doing the head would have done the valves and seats then assembled the valves in the head for you.
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