My only experience with them is 20 years ago I bought a manual choke 750 and tuned it death.It seemed to run well enough but I tried a 750 holley vacuum secondary and went .2 quicker in the 1/8 mile on a warmed up 440.
I think they are well suited to milder engines and for the crown that likes an electric choke on a cruiser.Never considered them a max performance carb after that.
I still have that same holley and it is currently on a stroked 351 windsor in a mustang of a buddies.The edelbrock is long gone.