Header bolts stripped

Ok got the head off and at the machine shop gonna have all the holes done. Good news is the guy I bought car from said previous owner had engine freshened up but wasn't sure what was done..well it has new pistons for one and engine looked super clean. Has a bigger then stock cam specs unknown. The heads have better springs and retainers , also new bronze valve guides..

While you have the heads off, you can find out what your compression is by following this thread:

How to Check Compression