A coupla things on the Edelbrock carb. First, there are (should be, anyway) three holes that the accelerator pump linkage can be installed in. The middle one is the factory default. This linkage is at the left front corner of the carb. You can try different settings to see if this helps. If it's not getting enough fuel shot into is as the seconddaries open up, it could cause the kind of symptoms you're describing.
The other thing that is kinda important (because there's a lot of misunderstanding about it) is that the two adjustment screws in the front of the carb are only for the idle mixture and will not affect the operation at any time other than idle. In theory, anyway.
Finally, if you need to change jets or metering rods, you'll need to get a "tuning kit" that includes several sets of jets and rods. The metering rods can be replaced without removing the airhorn (the top of the carb) but you'll need to remove that if you want to change jets.
Ohhh...one last thing. If the carb has an electric choke and it's disconnected, that doesn't mean that the choke will never engage. The opposite is true. The choke will be engaged all the time, or at least until the underhood temp has gotten pretty darned hot. This can cause all sorts of problems, such as running rich, flooding, black smoke, etc.
Let us know how things work out.
