$2350 for an EFI system???
OUCH!!!
But yeah there are "hidden" costs
Such as that "corvette style" fuel filter/regulator is only $30 but the connections/adapters people use to get it to -6AN will run you $50 for the set.
Then of course, everyone wants to run braided instead of rubber EFI hose.
That's like $5 per foot.
I checked the beginning of your build post and MAN seems like you went through it in the early stages.
I'm sure you have a fire breathing dragon by now tho.