66 Dart, 408 runs hot. HELP PLEASE!

fklskv said
Try running a colder plug? This an excerpt from NGK

This was my suggestion too.

I use to run extremely high compression on a race boat. While everyone was running High Dollar Race Gas, I was running 93, with 104 Super Octane boost, and NGK 9's instead of 7's. Tried the 8's, but it ran better with the cooler 9's.