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I have two friends that have LS6 heads and they both went with the MLS gaskets and also used the stock head bolts. However, using ARP bolts would have been more convinient. Good Luck.
I'll be using 6.0 GM MLS gaskets (part number 12589226) with ARP head studs. That way, if I ever decide to swap heads again in the future, I'll save time on the clean up.