Well that stinks, that the nut had to be such a PITA for you. Replacing a 1 piece brake, or fuel, line is nearly impossible with the body on. Can be done, but usually involves removing body bolts and lifting the body some.
Do you have access to a hydraulic double flaring tool for flaring the line on the car ? These are a wonderful tool for that and form a perfect double flare easily.
"Talking" on the internet, seems like we are just down the street and could help each other out with special tools, rather than hundreds of miles away...
