Re: EA carbi ...
The EA never had a carby, what you have is CFI, 'central fuel injection', which has a twin throttle plate with 2 injectors. It works quite well, but isn't performance orientated by any stretch.
The best solution for you is to convert it to a multi point injected set up which uses 6 seperate injectors with a common largish throttle body.
These days they are plentiful around the wrecking yards and should only cost you a few hundred dollars.