I had a ***** of a time with the lines on my last 86, with those tools. After some wiggling and an extra screwdriver in there, it came out. Some older clips are just a horrible to get undone, so play around with it, try maybe a smaller tool to get difference pressure spots, and take frequent scotch breaks.
1986 Mustang GT T-Top, SCAT 331 stroker w/Probe SRS pistons, TFS 170 heads, TFS track heat intake, 30 lbs. injectors and matching Pro-Flow MAF, BBK 75mm TB, T-5 to AOD conversion, MAF conversion, full length subframes, Bassani ceramic coated 1 5/8 shorty headers, BBK high flow cat x-pipe, Bassani quiet thunder 2 1/2" catback, 3.73 gearing.