So I have a new six pack setup on the car. It's new from Holley, so the later carbs, not original ones.

I have the idle set reasonably well, still need to play with it but it does idle fine. Front carb is set, need to swap it with the rear one and set that one.

Took it for a quick run, and it felt good. When I went for about 1/2 or more throttle, there was a big hesitation, and then the secondaries kicked in.

I did replace the main jets with 66's, came with 62's. It idles with 10-11 inches of vacuum, and I have a 4.5 power valve in it.

Is the hesitation just the springs in the secondary diaphragms? I was told by Mike Goyette to put the white springs in, the lightest ones, but I don't have them yet.

Just want to get an understanding of how the system works.