Spark plug for Dart-Pro heads?

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Running 10.2 Compression with Champion RC14YC at the moment, gapped out to 40 thousandths right now. Anyone able to offer some advice ?
TIA,
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Changed plugs to Autolite 3926 and also narrowed gap a bit to ~37 thousandths .
Have heard lotsa storys about Champions plugs being for RAM brand and , Autolite being the choice for Ford vehicles.
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[bluevenom867]

I use NGK's

1. Are you running nitrous?

2. You got an aftermarket ignition?

 

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Not using Nitrous. Have a Crane HI-6(SL?) and the Crane replacment coil

 

[302RollinHard]

I would think that your current gap (.0037") would be a bit too narrow except if you have forced induction. Opening it up a bit may give you a better spark. Stock is .0054" I suggest between .0045" and .0050" with aftermarket heads and autolite 3924 plugs (2 steps cooler than 3926's)

 

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Hmm have set em at .037 think not .0037, maybe my understanding of thousandths is off ? Seems to run a bit better. My engine has 10.2 compression . Check my garage , car data is in there.
Thanks for tryin
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