1976 fuel injection questions Options

[914incali]

Picked up a 76 out of texas that had been converted to single carb that just doesn't run very well. I decided to convert back to original FI, essentially everything is gone and I am working on understanding the system. I guess my first question is where does the fuel pump draw power from? there is a single black wire underneath the fuel tank that has no power to it but all the relays have been removed and Im waiting on those from pelican

[Ron914]

I believe it was @ emerygt350 that asked @slapshot what happened if the small oblong hole inside the throttle body was covered up but I do not know what that would indicate .If I cover mine up while car is running it sucks my finger tire and the car will die if I keep it there.