You jet the carbs to get proper air/fuel ratios. Putting two carbs on an engine doesn't necessarily mean that you will be jetting down. Likewise switching a carb from a smaller to larger engine doesn't necessarily mean you will be changing jets.

R.

I would take the 2x4. I have the same. Run them the
first season and I can´t be more happy.
Tons of torque, great throttle response.
2x600cfm but still a little bit on the rich side.
I wouldn´t use the bigger jets Edl delivers with
the dual quad. I also do not like the comparison
of the different intakes. The cam should be grinded
to your specific needs. Mine is a solid flat tapped from
Scott Brown. Awsome power! And cheaper then the 2x3.
A friend of mine changed his 1x4 intake in his 68 charger
to a 2x4 and he said it was like putting in another engine.
Way better throttle response and awsome torque.

Which set should I get #1406

Edelbrock jet kits

You need an exhaust gas analyzer to really get it dialed in. There is NO WAY that someone can tell you what jets to use with so little information.

In general the Edelbrocks are set up quite rich if they come with manual chokes, and quite lean if they are built with electric chokes.

R.

A few months back I did a dyno shoot out and posted the results here. A single four M1 with QF 850 won making 670 horse, the Wieand tunnel ram with duel Edelbrock 650 made 656 horse and the sixpack did 648. This was on a 541 cube pump gas engine.

for a 541cui engine the ch-28 would be no good choice.
and lots depends on the cam. i do not think you
can compare 3 comlete different intakes with the same cam.
they all have different "needs". it can´t be more different.
a low rise dual quad and a tunnel ram.
what about the torque?