Valve Cover Gasket Problems

I did a ton of work to my car last year and ever since my valve cover gaskets have been leaking and it's getting worse. I replaced the main one and the plug seals (they are fine) but I couldn't replace the bolt grommets. The bolts have a flare on them so I can't remove the old seals and put new ones on. Do I have to buy new bolts or what? Also one the bolts stripped the threads on the head so I can't tighten it to specs. I used a torque wrench so I know it didn't strip from being over tightened. What's the best way to fix the threads, fill the hole and tap or maybe they make a heli-coil type fix?

I tired of smelling burnt oil everytime I stop somewhere so I guess it's time to fix it.

Thanks in advance for the help.