Any idea where your barrel valve is at?
I am new to injectors but I can offer this.
From experience , make sure all of your butterflys are closed. Remove the stacks & use a very thin feeller guage to be sure all are closed. You can open up, but can't close if some are hung open.
I would then recomend using a leak tester to set you barrel valve. Block your secondary & connect to the main supply to the barrel valve. My crowers on alky are are 27%, probably wan't less for gas, say around 23%.
Double check the obvious stuff. (spark, timing, firing order)
Give her a squirt with a bottle & she should fire.
If not, I would look at the spool orientation, but the leak should tell if something is not right.