Do you have an old Stovebolt engine with an original 1 barrel intake manifold and want to modernize it have a more reliable time cruising around town?  Here is an affordable solution going EFI using Rochester 700  based(Chevrolet, Buick, Olds, Pontiac, GMC) 1 Barrel TBIs with custom injector plenums for use with GM based self tuning EFI systems.  This is for our larger 1.75" throttle bore unit (standard unit has a 1.50" throttle bore).  This listing is for 1 new Throttle body (1.75" throttle bore), 1 adapter, 1 plenum, fuel injector caps, gaskets and mounting hardware for for fitting these custom throttle body units to any 1 barrel intake manifold with a 2-15/16" bolt spacings.  The spacer is 3/4" tall and tapped for 5/16'-18 hardware (a 3/8'-16 adapter studs kit available for $10) and are CNC machined out of 6061 Aluminum.  The kit comes with 1 NEW Throttle body, 1 adapter, 1 plenum, injector caps &  hardware and mounting hardware for adapter and 1 TBI gasket (intake manifold, injector, air cleaners, map and IAT sensors pictured are not included).  Works with FAST and Holley based EFI systems, you can have a unique 1x1, 2x1 or 3x1 barrel EFI system.  Pictures show the 2X1 setup and are for reference only.