That nut looks untouched to me. If you can get a little more muscle on it, or use a longer flare nut wrench, that would be my next step. Then try heat. You didn’t say if you were trying to save the master and line, or if it’s being replaced
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‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
‘55 Catalina
‘62 Mercury Meteor-all original, bought new by my grandfather
71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.-now my sons ride
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