I target .028-.032 gap and have 25 psi on an 8.5 compression motor at 7500+ RPM. I have a CD ignition of modest size, but it was also fine with the Ford TFI system and MSD coil. C16 fuel. 22 degrees timing.
If a system is gap critical..... the ignition is too weak. I can gap my plugs at .040 (wide as I tried) and not miss a beat.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)