This is a Singleplane Holley EFI manifold, modified and an LSx throttle body. The stock height of the 9901-101-1 Holley manifold is 5.65". We milled it down to 4.125". The elbow is 4.75" on the hood centerline. This will fit under the stock C4 hood. Throttle body is up-side-down in this application (2 bolts top, 1 bottom). The throttle body is from a 5.3 liter Vortec truck and is 76MM. (2.992"). A LS1 fbody throttle body could work as well. The plumbing to the supercharger is 3" plastic pipe with an aluminum finish. I have not installed the BOV, but I intend to and it is a Bosch BOV from an 1990 Saab turbo. For this application I'm using 30# SVO injectors, and a 1-bar map speed density code for roughly 6psi of boost. I'm currently using PE for enrichment, however I will probably switch to an FMU due to the lower boost levels of the powerdyne supercharger. (The engine is 10:1 compression). For a lower compression-higher boost application, a 2-bar map sensor would be a better fit.