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What if a cylinder head has a O-ring receiver groove machined into the heads, and your not going that route. I know decking will take care of it, but what if you dont want to deck out the groove?
The block will not have the groove in this case. I dont see how it can effect the seal as long as the O-ring is inside or even out side the head gasket fire ring?

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Been there done that more than once, go for it Make absolutely sure that the head gasket will seal up before the O ring groove, don't have the O ring groove in the combustion chamber area and cross over under the gasket