Generally speaking, you'd go a couple of thou closer than std if the boost is high enough to start to challenge the ignition system's ability. If you are running upgraded electronic ignition std gap should be fine. fwiw, in the past engines have come out of the factory with as little as 25thou plug gap.

I should have probably added to my earlier post, that although it's the extra VE of the secondary being open that causes it to ping (where it won't if you lift the throttle), it's still possible above and beyond that that the secondary jet and air corrector need to be changed (bigger jet, smaller air corrector) - ideally a combo of both and they'll then affect the part throttle mixture less but make it richer the higher the flow/demand increases.