On my 302 powered '27 I'm running two 500 cfm edelbrocks. On my Jeep truck (with 302 Ford) I'm running one 600 CFM edelbrock.
The two fours actually aren't too bad, but the 600 on the truck is perfect. Just changed plugs after 3 years, perfect color, and good response. I have it on an edelbrock performer intake.

As for brand, I subscribe to the theory "Holleys will win on race day, but Edelbrocks will get you home." I have run the 2 four setup for 12 years, in pouring rain, numerous times, and they just keep on running.

Just my opinion.

Don