Get them from mopar. The last ones I got were P2932675. They made a significant difference in the performance in my Duster, but it is a high reving modified engine. What do you want to gain from adding these? I don't think you will see any performance gain with your configuration, and in fact advancing the timing too quickly may be detrimental. I did notice that you did not specify performance springs, are you looking for stockers?
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