[CC69Rat]

Are you running a factory style fuel pump? The typical mechanical fuel pump is going to push around 9psi.

The 1406/1407 carbs like around 4.5-5psi. Edelbrock sells a fuel pump specifically for this series carb. Or of course you could add an inline fuel pressure regulator. My .02. I think your fuel pressure is too high and it's causing the fuel to flood the needle and seat. It's a pretty common issue on the AVS series carbs. There are several articles online about it.

I'd put a good quality fuel pressure regulator on it. Start at 4.5psi and drive it. Adjust from there.

This could also be a heat issue in the carb. It runs fine and as you drive it, it gets worse, stalls at stoplights, Hard to start it if it's hot. Let it cool off and it will start back up. Edelbrock offers a phenolic spacer commonly used with these carbs to help minimize the heat issue. The heat from the intake soaks into the aluminum body on the carb and causes the fuel to boil. The spacer kinda insulates the carb and holds the heat down


Add the spacer, fuel pressure regulator and it will be a different truck.
Hope this helps


Article on the fuel pressure issues
https://www.carburetor-blog.com/know...oubleshooting/