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Cracks propagate. I would not run it as is. First step would be to break the head back down and Magnaflux to determine how far the crack has propagated. I would check all heads not just the ones which have visible cracks.
Depending on results I would either remove the boss and enclosed crack entirely (I would because I like hp) or weld repair if it has gone beyond the boss into the head. The weld repair is less attractive because you start the valve guide job all over again whereas you may save time with a port job with the existing guide in place should you have the option to remove the boss and whole crack. I would also blend the seat as you hint to.
Good luck.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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