Holley carbs were sunken into these hemi manifolds at Daytona. While Chrysler officially attributed the deep design to hood-clearance issues, its “ram-boost effect” reportedly added fully 50 hp coming off of superspeedway turns.

http://www.hotrod.com/articles/funny-cars-can-trans-women-racers-emerge-1966-2/#012-struggles-1966-static-hemi-intake-daytona