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The Mass-Flo EFI system is built around an Edelbrock Victor Jr. intake manifold for the 351 Windsor. If you look closely, you can see that the manifold has been extensively modified. New threaded openings are present where none existed before. They will accept the required sensors. Mounting bungs for the fuel injectors have been welded into position above each intake port. The 1,000-cfm throttle body is also shown with idle-speed motor attached.