Got the gas filler neck connected to tank. Looks angled down here but it's not. Still, we'll test it to make sure it fills properly, otherwise I may have to shorten the uppermost section a bit more, but that's "rod-work"....
Finished tracing and labeling the EFI harness and got all the various bits grouped into systems. Doing so I found that the MAP (Manifold Absolute Pressure) sensor and BP (Barometric Pressure) sensor were missing (likely still in the donor car).
With the grounds all carefully gone through, including this cable from the manifold to firewall, all that will be left is connecting up the custom rad hoses and filling the respective fluids and we'll be in "fire" mode!