Way back when i was 17, a guy my brother was friends with gave me a 340 Challenger needed a transmission.
Had I think Blackjack as had slip tube on driver side header no fancy spark plug wires or covers used I never burnt one ever. Changed them out for some Headman AK5000 since I dressed engine up when no did a refresh and wanted aluimiunm coated. Same no problems. Also no problem with Hooker, TTI or Doug's. And how often does on change plugs geez.
In fact I had seen more plug wires burnt on 340 HP manifolds without the heat shields than headers.