I have swapped out the fuel pump, same issue.
Carb has been apart several times. The first time I took it apart I did have to fix one of the floats.
My other 440 Charger has a Proform 750, basically a Holley knock off. I've been hesitant to install it on this car since that will require more work and just borrowing my friends Edelbrock since this car is already set up for an Eddy carb. I also tried an Edelbrock performer 625 CFM on this car last year and had the same issues but thought that some of it could have been attributed to the carb being to small for the motor.