carb loading up
are you sure its the carb and not the ignition ?
Ding!
Your issue is likely rooted in the timing of the engine, IMHO. I've fixed a bunch of "carb" problems over the years that really had nothing to do with the carb.
Do this and DO NOT drive it. Grab your timing light and set the timing at idle to 20* BTDC and reset idle and mixture screws on the carb. Check timing to make sure it hasn't dropped any out. See how it runs. I'll bet money it runs better than it does now. Cleaner and crisper response when cracking the throttle. I suggested a timing set up in your other thread, I know it's works, that you chose to apparently ignore. Keep setting it the old fashioned way which isn't the best for your car and your car will run like garbage down low.
Another little test. Turn the distributor body clockwise slightly, if the engine picks up RPM, the ENGINE WANTS THE TIMING, it's running more efficiently. The original initial timing setting isn't correct.
If vacuum is really low, you may need lighter metering rod step up springs.
Most ede 750 carbs are rotten to deal with. Got bad metering in them.
People will also appreciate you not gassing them out.
There are a TON of threads about how to set timing on this board.