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In response to your original question. I am using NGK GR4 on my iron-headed 472 pump gas Hemi in a Sport Fury. As for induction, I am running a Mopar cross ram with 2 770cfm Holleys. I have spent over 1 1/2 years off and on, tuning the carbs and reading the plugs. The addition of a wideband gauge allowed me to tune her so much quicker. A wideband may appear out of place but you can remove it and plug the O2 port once you get your tune correct.