B & M shifter question
I've got Schumacher headers so I don't have the routing issues you do but I still used a Thermo-Tec sleeve around the cable to shield it. I've heard of guys using heater hose and what-not as a shield.
Mine comes off the front of the trans, loop across the lower bellhousing, and then up to the shifter on the right side.
http://thermotec.com/heat-sleeves.html