I worked at Holley for eight years - many moons ago. The guys at Quick Fuel were coworkers and friends - still are friends. I tried one of their triple throwdown Dominators on my Engine Masters engine and it worked great. Responded to tuning and bleed changes and once dialed in it delivered a really smooth A/F ratio throughout the pull. The O2 supplied data looked like an EFI map.
The Carter Edelbrock carb simply is not intended for hard core performance. Open the throttle (on a dry one) and look up through it from the bottom. Nothing is smooth, nothing is round, and there is a bunch of stuff hangin into the breeze. Not good for clean airflow. Done.
The Holley is lots better from an air management perspective. And the BG stuff is a functional clone of it. So now we're talking only features, quality, and cost. Both will work equally.
From a dollars spent view, an out of the box piece is hard to beat - especially if you are willing and able to fuss with things. If you're not comfortable with playing with multiple bleeds and such, an out of the box part might actually keep you out of trouble.
As to features I tend to prefer a carb that's "too big" since the popular formulas are all flawed. They don't take into account the fact that carbs are rated against a 1.5" vac. drop - a built in restriction. You need the restriction to generate a comparative rating value, but you don't want it on an engine! Then we work to tune around the big carb by trying to increase the signal at the booster so that we have enough "solid" fuel flow to tune with. Signal increase can come through downleg or annular boosters and booster position relative to the main venturi, as well as tweaks on the booster profile (skirts, undercuts). Now the bleed work becomes really a matter of introducing air leaks to reduce signal and fuel flow at various points in the curve.
The original intermediate circuit designs were for NASCAR where they would floor the car from 2/3 throttle coming off of a turn. There would be a huge hole in the fuel since the accelerator pump would not work at that throttle opening. Hence the intermediate was always pig rich - - it served as an air driven pump circuit! Back before drag guys realized how much fun they could have playing with them, it was pretty common the block off the intermediate completely. Still not a really bad idea on street cars. That O-8082 will run pretty darn nice on the street when you hang a set of annular booster in it....and pull a few jets out.
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