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Hi,
You certainly have a toughie on your hands there.
In the pic of the top of the stuffing box it looks like you have tried to get the nuts off with a chisel, they are a lot softer being bronze so this isn't necessarily the best method of attack.
Being Bronze though they will be open to some other forms of gentle persuasion. Take your hammer and give the flat surfaces of the hex section a good work over. This has been used by me many times to loosen barrel unions and the like that were seemingly locked forever. Also try to use a wrench or something that lets you get a good grip of the nut as a whole, even a Vice Grip Chain Wrench would be better that the chisel at this stage.
If you can see if you can get the two nuts separated a bit wind the lower one down as at least then you will know for sure you are only dealing with the one stuck nut, also try to get as much of the rust off the shaft immediately above the nut as possible, this will give the penetrant the best chance to get in and will be one less thing to fight against when unwinding the nut.
There is also an outstanding penetrating oil available from Aircraft supplies places called Mouses Milk. This is the all time best stuff I have ever used. It can loosen manifold nuts.
Good Luck.
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Cheers,
K1W1
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