The sad fact of life is, multiple carb setups are just not as smooth or as good performance wise as a good single four barrel. However, nothing looks better on a hot rod than 2 to 8 of those little buggers perched on top of a motor.
As the guys mentioned, the old favorite was the stromberg 97, but they did leak and were hard to set up on multiple setups. New improved gaskets did solve some of the leaking, but they are still hard to find and expensive. There are new versions of the 97 being made, but I have seen negative reports on those, and they are $$$$$$$$$$$$$$$.
The other option is the Rochester 2G carbs, and that is what I am using on the 394 Olds for my rpu project. They are relatively cheap (I bought a bunch of them on Ebay and paid $ 15-$ 25 each) I am using the best 3 and will put a kit in them and use Vintage Speed bases under the end two to eliminate the idle circuits. (You only need an idle circuit on the primary carb that you run on until you kick in the end carbs) When GM introduced the tripower setups on various Olds and Pontiac engines in the late 50's, they did exactly that, and the two end carbs were only dumpers.
The 2G's flow a lot more cfms than the Strombergs and are relatively problem free. I had two of them on the 350 in my 23 and they worked well, but never as good as the single four barrel I had on it at first.
Don
Here is the setup I will be using on my Olds engine:
Here is the setup I had on my 23:
And if you want four carbs, here is a setup Gastrick sold me for my Son. These will go on either a Grafitti clone or maybe on his 46 Tudor.
Another option is two fours. These are easy to setup and run.