Guys,
The old '69 Nova w/ a 468, blower, headers, & Merlin heads decided to run awful rough this spring. When checking the plugs I noticed that three of my plug wires had been seriously burned by the headers, and this was "through" the spark plug heatshield boots that I have on each plug. Tonight I changed plug wires and took it for a ride. When I got home after about 15 minutes of driving, three of the plug wires had smoke coming out of the heatshield boots. I run a coil-per-cylinder MSD ignition system, so the wires all come straight down to their respective plugs - it's not like they're wrapping around the headers all over the place. Also, timing maxes out around 34* total and all in by 2500 rpm, so I don't think I'm advanced to the stage of causing overheating. Finally, I'm running a Bill Mitchell Hardcore 870 carb with 80 jets in the front and 87s in the rear, so I should be rich enough to avoid any lean overheating issues.

What do the rest of you do to deal with heating issues like this?

As always, Thanks!