Can't help with the NOS gap, but for N/A I'd start out around the stock setting of 0.050-0.054". If you've bumped the compression and have an aftermarket ignition box, then you can start working it down some. I've run mine as low as 0.035" but tend to gap them around 0.045" most of the time.
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Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team