What I am saying is there is no advantage of one carb over another in terms of power. They all work equally well. The variable venturi Rochester flows the maximum amount of air needed to feed the 283 (up to 750 cfm if the 283 sucks hard enough). The Edelbrock/Carter AVS works the same way but it is a square bore carb like the Holley and will require a new manifold. Holley only sells one fixed cfm spread bore carb now (they used to have three different cfm model number 4175 carbs available in both vacuum and again as a double pumper for a total of six carb choices) which is too large for a 283 for street use at 650 cfm. (Holey model 4175 List number0-9895 http://www.holley.com/0-9895.asp
If you buy a Jet Performance rebuilt unit, or one from The Carb Shop in Ontario, California it will be still cheaper than the $495 or so for a new carb. I am not alone in expressing the virtues of the Quadrabog that will put a Chevelle 454 super stock car in the nines with a stone stock carb just using a tune-up. Read this article
The small primaries, the efficiency (due to it's complexity) and the fact that few people are really good at tuning this style of carb all lead to people think the carb is no good, but it is ideal for a SBC or else Chevy wouldn't have put them on top of the engine.
I run Holley's (I freely admit it) but I was bolting Holley's on cars in place of the Carter AFB or AVS (not a Rochester QuadraJet which had not been invented yet); because they were bigger (and back then I was young enough to think that bigger was better in carburetor selection (I have learned better)). A Holley can be tuned with a bucket full of parts that all screw together with a screw driver (or used to), and of course the knowledge of what to do. The AFB's I had used before are just like today’s Edelbrock AVS model which uses rods as well as jets and requires springs and connecting linkage to tune, along with a lot more hard to find knowledge (everyone I know is a Holley "expert"). The Rochester Quadrajet is the most complex of the carbs to tune, but once set up it stays set up, as nothing can unscrew or back off, or get out of wack as everything is vacuum operated.
It is the single most reliable carb and one of the best fuel mixers for street use since the Weber. I will admit it isn't very sexy due to it's being under the hood of every GM car made since it was introduced in 1965, but then if it isn't a Quadrajet it is a Holley.