I have an edelbog on my car, and it has the same issues.

It also is a 750cfm. Last year I "borrowed" my dad's 600 cfm edelbrock for a while, and I was surprised how much better it ran with a different carb!

I now have the 750 back, I have been able to tweak some stuff to reduce the bog...but still there.

Soon to make some changes..Try going with the 800 or 650 cfm if you are hell bent on an edelbrock.

Hope this helps!