Re: NGK Spark Plugs..
Our L72 and L78 engines always ran fine with the AC 43N plugs. If and when I can't get them, NGK would be my second choice. With unleaded gas the plugs last me at least four times longer than when I was using leaded gas. A friend used to do mostly city driving and ran the 44Ns and tried 46N but thought they might be a little too hot. He never had any damage done though.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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