Classic Austin Mini Kent Cam Kit Md246mk With Lifters And Springs

I ordered a Kent MD 256 cam from you and I now have it and am slowly getting the engine together. The engine 1098 has a DCOE 40 Weber carb and headers with 2-inch exhaust pipe. The heads have been 100% rebuilt with hardened seats and all new guides and valves. My question is would heat wrapping the headers and down pipe be a positive thing or negative. I asked that question online and got widely mixed reviews from yes it's a good idea to it will cause the vales to crack or set the engine on fire. Who is right?