engine help please

[1sik7t2]

ok,heres the deal as some of you know,i'm doing a engine swap in my burb,a 2005 lq4 6.0 litre....from a gmc savanna.... "project Dirty Burb" got power to the new fuel pump fuel line ran, no return line on this 1 all hooked up but it wont start unless sprayin carb cleaner into the intake.... only thing i can think of is vacuum lines need to be hooked up or .. the mass air flow hooked up to the throttle body....it hasnt been the last few times i tryed....my garage smells really really bad from the gas fumes, terrible like it's only tryin to run on fuel,,,,,thats y im thinking the mass air flow.....anybody a chevy expert...or really know your chit PLEASE HELP thx dave