You can use bolts. Ive done it probably a hundred times. Just be sure to use good bolts.
I sourced out/tested the sealant (And about 20 others that didnt make the cut) used with these gaskets back in the late 80s and used it with copper head gaskets for years. In probably 94, I started using the sealant on double stacked shim gaskets and sold that setup for a long time until a douchebag figured out what the sealant was and leaked it to the Internet. Just to be clear, Jason was not the doucehbag. LOL