You might have to loosen the motor mounts and jack the engine up a little. Accell makes a short-insulator spark plug for use with headers that might be an option if you can get them in the right heat range.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!