well napa is having a really hard time finding the correct colder plugs for my car. i need recomendations and part#s please. 440 10.8-1 comp .550 260 duration cam 906 heads 175 shot n2o 4.10 gear 28-13.5 r15 et streets.

Try Accel #132, if they are not cold enough then try Autolite AR73 or AR72 or Champion J6YC or J6Y, maybe J57Y. The iron heads are making the selection very limited now that all the production cars have aluminum heads and the spark plug companys don't sell many of the spark plugs for the older heads Stock up while you can

autolite ar 72 or 73

thanks guys.