Edelbrocks aren't that bad if you take the weighted valve out.

I have an 850 that sits on a 429 in a dirt track car. The absolute best thing you can do to an Edelbrock is take the weighted air valve out of them. On my race car it would have a flutter at high RPM that felt like an ignition miss. A local guy at the track said he had the same problem and took the valve out. It made a world of difference. I've removed several from friends street cars and it made a huge improvement for them.

I've also got a very healthy big block in a Monte Carlo with a Demon 950. The only issue I had with it was the needle valves aren't that great but the Holley needle is a direct replacement. It has always been a great carb.

All the Holleys I've had seemed like I had to rejet them with every season change.