They might has assimilated Earl's stuff since I last looked at Summit. Just get a good set of copper core gaskets and call it good.
Spray all stock bolts with some penetrating oil and let them set for at least 15 minutes before you try to back them out.
Don't skimp on the header bolts. It will be money well spent vs. having to retorque the bolts all the time and getting more leaks at the manifold or header...ask me how I know.