The heads are already off the engine and apart, that's half the battle. I would send them to a good machine shop and have a valve job done with new valves . Maybe convert to screw in studs . Years ago a friend of mine tried to do what you are planning to a set of 670 heads. He cleaned the old valves with a wire wheel and lapped them in with compound. The results were anything but great after he put them back on his 428. Eventually he sent a spare set of 670 heads to Nunzi. The heads came back looking brand new with high flow stainless valves. He swore the 428 picked up a noticeable increase in HP and the engine ran great for another 30k miles until he sold the car. Some things are not worth doing yourself, leave it to the pros with the right equipment.
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