I must say i have never once used the Holley method of setting the accelerator pump overide spring.
Adjust the spring to provide slight pressure on the pump arm at idle so that even the slightest movement will push fuel out the shooter and then just check there is some spring travel left at wide open throttle.
That routine with the feeler gauge is confusing to most people.
Think what it needs to do and then adjust it to do that.
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