You agree with fuel pump location.

I installed regulator after carb fuel log. (see figure 3) Supply line/fuel bowls/180turn/regulator in/regulator return. You can't see the return line in my pic, it is on the bottom of the regulator.
https://documents.holley.com/199r11227.pdf

Awesome, can't thank you enough you all have been super helpful. Try to update this thread when I make progress.