I have 1 cylinder in my 1970 440 that carbon fouls, almost positive its a valve issue. All other plugs still look great. (Bosch Platinums). Engine has 154,000 miles and car was abused before I bought it 20yrs ago. Per pic, I know I waited too long to check spark plugs. Carbon fouling to point of misfire usually takes 10yrs (I only put 700 miles per yr, so 7000 miles). Always misses a little when first started but all 8 fire after a couple minutes. I'm lazy and cheap so I've tried...
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