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I am running the gm mls ls7 head gaskets on my afr 225s and 408 . Cometic would be my choice if have any trouble with these ls7 head gaskets. I am hoping the ls7 can take up to 20psi max but likey won't need to go past 15psi to hit my power goals.
I used the cheap felpro stock replacements. A light coat of engine enamel on them and put together while tacky. Once baked on you'll never get them apart.. 15psi + nitrous for 3 years now and never an issue.