Good Question! I've actully been researching this starting this week too! I've gave up on having a good working parking brake, and i've replaced everything too. I want to use a Line lock not only for the track, but for a parking brake too if at all possible. I'm hoping i can get this to work, I need help though. Like I said I want both feature to work.
I just need to figure out how I can keep the rear calipers engaged when parked. When do you plan on trying this mod TDC? If you do it, can you explain how and maybe get some pics? I wanna do this ASAP, but I need to learn more first. I really need to find a way to lock up the rear end.
I donno what brand you plan on using, I'm thinking Hurst. Mostly because I knew people who ran that brand back in the day with great success.
Will the portioning valves get in the way of this setup? I've been wondering that too...
