If you're looking for a unique way to switch from carb to EFI, TSP's 105mm throttle body elbow will help get the job done. Fits GM LS throttle body and Holley 4150 flange. Throttle Body Mounting Flange: LS.
TSP 81141BK Intake Elbow Holley 4150 Flange with LS 105MM Throttle Body Pattern
TSP 81141 Intake Elbow, Holley 4150 Flange, 105MM Throttle, Cast Alum. Natural
TSP 81141 Intake Elbow Holley 4150 Flange with LS 105MM Throttle Body Pattern
TSP 81141P Intake Elbow Holley 4150 Flange with LS 105MM Throttle Body Pattern
93-97 FOR Camaro Z28 LT1 LT4 Pontiac Trans Am Aluminum Intake Elbow NITROUS KIT
New LT1 Aluminum Intake Elbow + AIR FOIL Nitrous Port For 93-97 Camaro Trans Am