Not trying to build your car or engine, Jim but (always a but right?
) if you haven't already bought the Webers you might want to investigate the similar looking throttle bodies that are used with EFI. I doubt there is any significant pricing difference when either setup is finished but I suspect you will really appreciate the tunability and throttle response the EFI will bring to the engine without loosing that stunning Weber appearance when the hood is opened up.
Ed