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I would use a Heli-coil kit to repair that stripped bolt.Those header gaskets are a large square port. Are your headers also square port? Most that I see are oval port and have a raised flat bead around each port. If this raised bead has a significant mismatch with the square shape of the gasket (I'm thinking in the corners), you'll have leaks no matter how tight you get the bolts.When you remove the passenger header to fix the bolt hole, check for a good match between the header and gasket sealing surfaces.
Sorry for the cussword, didn't realize this site was for 1st graders
Language isn't necessary to get your point across.