Stock vs aftermarket efi

[Flysocal]

Was reading LEEVONs thread and it got me thinking. What is the advantage (if any) to running a stock intake and efi system on LS swaps?

I spent hours cleaning my truck intake (dunked in purple power for 24hrs) so I'm already committed to using the stock setup. But I haven't dumped $550 on a new psi wire harness yet. So I can still change my mind. This will include the tranny harness but does not include a 200 ecu. And I will still need a custom tune at around 200+ so moving forward I'm still looking at around 1000 to run my stock system.

Here is the $800 unit from fitech

Good to 400hp which is fine. Will running this eliminate the entire engine wire harness? I'm gonna do more research but in the meantime please discuss