EFI Bung in head update

Very creative. Just a question. Do you think the risk for coolant leaking is worth locating the injectors in the head? In other words, it would have been just as easy.....or even easier to locate then in each intake runner. Was there a specific reason for not doing so? It looks like maybe 2" back and you could have done that? Is there a real advantage to getting the injectors closer to the valves I guess is what I am getting at?