If you are talking about the 2 flare nuts (the '84I has a linked braking system) that connect the steel brake lines to the master cylinder, here is how to do it. First, you will need a flare nut wrench. An open end wrench will destroy the nuts, they are very soft. Put the flare nut wrench on the fitting, then use a small pair of vise grips on the outside of the wrench to squeeze it tight against the nut. You can then remove the nut without bending either the wrench or the nut. I have done it this way for decades. The nut is made of some kind of super soft metal (not sure why) and even the best quality wrench does not fit on it tightly enough to avoid deforming it if it is really stuck.