I run an airgrabber/Holley/Eddy RPM on a 440 Cuda under a rally hood. I started with a 383 cleaner and cut out the neck, then grafted (welded and epoxy) the neck from a generic drop base. It's a tight fit. Only about a half inch clearance to the hood in few spots. I run a poly lock mount on the driver side--you want LIMITED motor movement!

Had to mod the support bracket on top too,in order to clear the Holley bowl vents