OEM is perfectly fine provided your not going above 12 psi and you have installed it correctly (ensuring the head and block surfaces are prepped properly).
Past that, I believe it all depends on what you did/do. If you have to shave the head, you will need to go with a thicker headgasket and at that point I think you want to go metal. Also, would recommend the ARP head bolts just to keep you on top. If everything is prepped properly you should have no issue.. but its not a cookie cutter answer, because each HG is built for a different purpose. (my thoughts)
oh.. and start your own thread rather than tagging onto one. Makes it more likely to get the desired response.
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