ok, i feel the wrath of the misfire. If the plug wires are heating up because of the manifolds, would putting headers on it make it any better? it would allow more room between the wires and the heat source.......just a possibility.

 

Thats is an "if'y" guestion...I dont know if it would solve your prob. It would help, yes. But i still think they would get to hot. Best thing i konw to do is get some heat wrap, and try to put the wires in teh right tension that they are as far away as possible.
Maybe soebody else will know...Sorry