The spark plugs in my new Pantera (5253) are running black. I am seeking advice concerning how to proceed.

After pulling the K&N air filter out and realizing it was so clogged you couldn’t even see daylight through it, I think I may have found a possible cause for the cars crappy running state of lurching under load, misfiring, and cutting out when trying to take gently take off during test drives around the block.  The filter has been replaced but as the car still wants to sputter and lurch occasionally, I’m theorizing that the plugs are fouled up pretty badly.

My cat has a 351W with a 383 stroker kit and Edelbrock Victor Jr. heads. I’m currently running Autolite 3923 plugs and I pulled one plug to check it out. It’s blackened pretty uniformly. Should I stay with the 3923’s or move up to a slightly hotter 3924? I am not using forced induction, just basic multi port EFI. Also, what would be the recommended gap? I’m also assuming that one should not apply excessive torque when reinstalling plugs into aluminum heads. Any suggestions on installation techniques?

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