I ended up getting this out with a 14 mm deep well snap-on socket. My manifolds were warped so bad I ended up double gasketing both sides of the engine. The number one exhaust port has a small leak in it still. The day Before I wrote this forum nothing was going my way an this bolt got the best of me. The next morning I wrote this forum an went outside to work on it an had the bolt out in ten minutes, an had the manifold on an off three more times that day. Sometimes patience an a clear mind can go a long way. Overall I had 3 people at 10 hrs a day for 5 days on this project. Tools needed- pb blaster, 9/16 deep well 9/16 shallow well, 14 mm deep an shallow( works well on studs that are worn from the heat) all half inch drive. Only use half inch drive for the removal. When assembling everything use a 3/8 drive. Some people recommend not using a half inch drive at all cuz it will break studs off. I pb blistered everything for over a month hitting it a few times a week an only broke one stud out of 16. My biggest tip is to put your whole tool box under your rig right off the start, saves a lot of trips out from underneath.
The hole you have on the exhaust can be fixed with the following:
It can with stand temperatures of 2400F