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If you do grind the boss/guide then you would need to de-bur and quick hone check for size. This would be a tradeoff of valve cooling for port flow. I would be more inclined to perform this on the intake side where cool air and fuel keep the valve temperature down rather than the exhaust side where you need all the guide contact you can gather for sufficient valve cooling. It is fairly common to see this on competition heads of many makes and HP levels. As I play with mostly turbo cars I don't normally mess with stock port profiles as there are other changes such as boost pressure/undercut valve head/camshaft that offer far greater gains for part cost/labor.
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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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