Dual quad info

Ok, so into setting up the Eddy 1405/1406.
From what I watched(video below), in a progressive setup he recommends setting rear carb (1406)slightly richer. As the fuel has to also reach front 4 intake ports. Should the 2ndary jets also be richened?
Front carb(1405) should be leaned somewhat. Should I also lean 2ndary jets as well.
I realize there will be trial and error, but 1405 needs jets anyway, so would like to get "proper" ones while I'm there.
Thanks all