i have a sb 400 in my 1980 z28. i cleaned up the plug wires and have run them up the sides of the motor. they sit pretty close to the headers and i have sleeves on the wires in the spots where they sit VERY close to the headers so that they don't burn up. however, the wires are still greatly heating up and causing the idle to bog down, misfires, etc. any suggestions on another clean way to run the wires so that they won't be exposed to so much heat?