I found a cross refrence chart that some body might be interested in for comparing the autolites to the ngk etc. i thought it m ight help some one. Mopar65

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3520 pound race ready 1973 Street/Strip Dodge Dart - Stock stroke 440/727 10.49 @ 125.0 on 93 pump gas & ET Street Radials. More to come... ( SGT Miller) Proudly served 12 years in the US ARMY RESERVES support our troops