The bolts they use in the trucks suck. They're not coated and rust/corrode. The Fbody engines have coated bolts and I've never had problems with them. Sorry to hear the bad news Bro. That bolt is in the worst place to try to remove. I take a nut close to the same size and try to mig/tig the remaining stud to the nut by welding through the nut. It spatters a little aluminum but it heats the stud up and helps to remove it.