Quest for info

Hi folks ??? Is there a ballpark setting for a 525ci Alcohol motor Idle check popit valve?. From earler post I read that 68% to 72% is ballpark for barrel vavle leak down. Looking for help on this info so if you could help please do Fuel System: Bird catcher 990 Enderlee pump, 1471 High Helix Retro Littlefield with nitro barrel vavle.