don't mess with to many things at one time....sure if you have no basic skills in engine mechanics.
Now that plug is indeed fouled and how ! ... so you found a first problem.Place 8 new plugs and be sure to have the right type for your heads ( taper or flat ring )and temperature grade according your engine , as Marlin explained. And try running the car .See from there. The only thing you risk is fouling another 8 plugs but that isn't THE cost i suppose...
greetz
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