superduner

So me and my cousin are trying to get this puppy started. the engine cranks good and smooth. : however it doesn't seem to want to turn on and if anyone has any experience with these your help would be greatly appreciated.

we have replaced all of the vacuum hoses with new ones.
replaced cooling fluid
replaced cooling/water hoses
the mass airflow sensor works. (put in the one from my cousins RUNNING l28et (Stock) )
hot wired a STOCK 280zx fuel pump (and it works and pumps gas)
new ngk spark plugs.
there is definitely spark going to all sparkplugs (tested)
firing order is correct ( referred to my cousins L28et and compression checked)
there is FUEL
there is power to the injectors

it seems like everything is as it should be to start up. we've reached a screeching halt after replacing alot of crap and wonder whats wrong with it. so i came to the forums to get help since the engine will most likely be put in a 72 z i get in the nearby future. so i want to get it running

please HELP me get this TURTLE back to life

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MY 1991 240sx LE Hatchback