340dart.812'S 70 340 dart

I didnt think to take pics while doing it but I removed the summit street and strip wires due to them cracking from heat and causing a misfire. I thought it was either the coil or dist. (Mallory L.E.D. Unilite dist and mallory super coil) So I bought a MSD blaster 3 coil and new mopar performance dist, and msd 8.5 mm wires. I installed them today. The wires are only 6 monthes old and you can see how they were routed in the first set of pics and they are cracking where they layed between the valve cover and intake. Did I have them routed incorectly or should they not have done this???