I dont think i explained myself very well....

Im using a 2.1ZVH with an rs1600i inlet with a 3" scooby throttle body on the end of it. Im using Microsquirt ECU. The car will run EFI injectors but the sandwhich plate that sits between the inlet and the head has been drilled to take the EFI injectors. I seen a few threads about this but no one ever seems to give a clear answer on how to drill the seats out. If you get me? lol