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autolite ar3922 or if a little bit colder ar3911
autolite plugs make about 5-10 hp more than ngk plugs all the time,, thought the ngk are easier to read
I will try them in the BB TR deal we'll dyno in a week or so.
Please do Brian, curious to know, post results 
me three 
Mopar65
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...
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