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Good luck, I got a 340 bored .040 over, pretty hot cam nothing to much 9:1 comp aries forged pistons K-1 H beam rods, reused factory forged crank and balanced it proform rockers bunch of other odds and ends Edelbrock performer heads and intake, 650 cfm edelbrock performer carb, running hipo...

I would think you read them just the same as the only effect the gas will have on the plugs is how they are burning not how to read them. Check out this website might be a little more help. http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp