I had one of those Duncan motorsports slap stick conversions on my stock shifter at first. I hated it. Always had problems getting it into low when I needed and had to remember the goofy sequence of how to shift it and do it exactly right to make it ratchet. I got frustrated with it and put in the B&M. Just sayin.
805, I found the heat shield stuff too when looking for a new cable and put it on for extra protection. No problem since. The big problem I had was with these stinking Hooker headers, I just couldn't find a way to route the 4' shifter cable they sent so it was far enough away from one pipe or another. I had well over an inch clearance with the 4' cable but apparently that wasn't enough cause it didn't take 15 minutes to fry it. With the 5' cable I found a much better route that gave me plenty of clearance.