The FAST EZ systems are the world’s leaders for simple and easy to install EFI.  They utilize throttle body injection (an EZ-2 kit is also available for port injection).  The EZ-1 systems use 4 injectors and the EZ-2 systems use 8, but to make sure that 8 injectors aren't an overkill the systems automatically phase the injectors as fuel requirements increase.  These systems are totally self-tuning and require at least 9” of idle vacuum in order to learn.  They do not support boost or alternative fuels.