I sympathize; my 68 Road Runner disc conversion was a brake bleeding nightmare. You give Fine Lines a grade 'C', well I give InLine Tube a grade 'F'.
You can bench bleed on the car. One piece of advice is to bench bleed with clear lines. Even tho you don't see, or hear any bubbles, there still could be some miniature bubbles. Bench bleed with clear lines in car is fine and have a helper monitor the bubble levels. This was a painful lesson learned (on top of many, many painful lessons on brakes).
Also, in my situation the lines were sucking some air at the proportioning block. The only remedy here was to tighten the tube nuts until they were damaged. I would have never done this, but after four weekends of fighting brake bleeding issues I called in a mechanical engineer I work with that was a former Porsche/BMW mechanic. He took this last ditch effort to get the brakes bleed. Now, I used InLine Tube lines, so hopefully your Fine Line product will seal better!
I'm watching this thread! Good Luck!
