I run 1.75 Hooker headers in my 72 Nova. When I did the engine compartment over I wanted to hide as much wiring as possible so I ran the plug wires down under the headers instead of over the top. I have angle plug heads and the wires don't even come close to touching. I use the 90 degree plug ends along with short plugs. You can buy plactic numbers to put on the wires if you are concerned about identifying which wire goes where if you pull them all off at once. I wish I thought of doing it years ago. I made a brace on each side to keep the wires from contacting the headers from underneath.