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 Though the carburetor has been removed, everything else can be reused with the Atomic EFI; vacuum lines, throttle and TV cable bracketry, fuel lines, and even the HEI distributor, though this requires some simple modification. The Atomic requires a 12V square-wave signal to trigger the EFI. In most cases, a common CD ignition is used, but we installed one of MSD’s HEI modules. The new module has a dedicated 12V signal wire to trigger a tach or an aftermarket EFI system.