Removing spark plugs from a body

1968 Barracuda with a 440 Magnum

SO for the life of me i cannot remove spark plug number 4 from my car- fender well is a quarter of an inch away plus then i have my stock header in place which is also in the way.

any one else ever deal with this?
i imagine everyone with an A body BIG BLOCK



help...:blob::prayer:
I had a 440/500 in a 68 Dart. I cut a hole in the fender well with a hole saw to get to the plug(s). - My headers were not in the way.