For every person that says they had good results with the Edelbrock 750 or 800 on a normally aspirated 440,there's 10 that didn't. I've used the 750 and 800 on warmed over 440s and found that unless the timing is dialed way back, the only fix is a different brand carb. Try doing a search for "Edelbrock off idle stumble/dead spot", It's a common problem.
I experienced the same results on multiple cars. My 440, a 360, a warmed over 351 Cleveland, 302 with cam and heads, and the list goes on.
I could get a bit better power out of the Holley (VS and DP) but the street manners and mpg was always better with the AFB.
For a while I had a Holley DP that I would drop under the turbos to get better power but it always got swapped for an AFB on the street. I ended up ditching the Holley and putting an alcohol injector above the AFB for big power under boost.
