What is important....the airbox above your injectors has to have the same cc as your engine....this means that the airvolume above the injectors has to be around the 2500cc.
Then i to had my injectors on the same spot as yours and have noticed that they spray against the inside wall off the adapter.....so the fuel leaks/ runs down to the valve
So i tried all the things you are doing now with this setup and mine did run also...BUT.... or it ran stationary fine but when reving it didnt got enough feul......or i adjusted is so it could run when reving the engine but verry rich when running stationary.
Solution....Make a bigger airbox above the injectors .
Put the injectors just in front of the intake valves. ( i had mine drilled in the original intakemanefolds )
You are 9n the right way and you will figure this out....yust keep on testing
