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Did you find much valve guide wear when you had the springs off?
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Well, I took the time to wiggle some of the valve stems just after removing the spring assembly and old seals. I couldn't detect any perceptible play. However, as the air pressure was holding it up on it's seat, that alone may have prevented my feeling play if there was any.
At any rate, I know when this engine was last rebuilt, and the rebuilder is a friend of mine, so I'm guessing that in my case, since the car sits in storage Nov - April, and doesn't get much mileage when it's running either, I believe my seals just plain dried out, moreso than wore out. There was a noticible difference in the internal diameter of the seal, old to new.
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secure the wrench holding the crack so it will not move
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230/8: Well phrased answer, 100% agreement, but I don't understand what 'wrench' and 'crack' emmydotnet is referring to? As far as I can see, there is no way to slip the new seals onto the stem unless they are completely bare.