EFI Bung in head update

I am wondering if you make the holes larger, then press in a sleeve with the correct ID for injector, and OD for a press fit to seal water jacket. Whoops, read you post better, already using bung.

Not sure about efi you are using. I had a 85 BMW 528e that had a slant six of sorts. Only 2.7 liter, but 176 hp and got mileage in the mid 30s. The injection was Bosch Motronic, used a flap with potentiometer for MAF, and two sensors on ring gear. Later units used single gear tooth sensor at front pulley. I would think retrofit would be possible.