Header bolts stripped

Well header header gasket was leaking and I went to put bolts back in and the very front one and very back one are stripped which doesn't make sense they threaded in and out several times no issues. This is on my 69 GTX with a 440 just wondering if you guys have any recommendations for fixing it in car I don't wanna take the head off. I don't think I can get a drill in there to drill them out..wasn't sure if I could attach a drill bit to something I can hand crank or not. Thanks in advance