You'll get a shot of fuel for sure, but like I said, you better have enough motor (and gears) to take what you're gonna try to feed that motor. With a vacuum secondary carb tuned properly, the motor will only take what it can handle. Without knowing what is in this motor, I think you're setting yourself up for disappointment.
I've run both a single and dual plane on a 383. Unless you're running a 4 speed with gears, or an auto with a good stall and gears you should stick with the dual plane. It will help the bottom end.
Somehow I get the feeling no matter what we say here, you're gonna go get yourself a double pumper no matter what. But first, a story....
Once upon a time, there was a guy named Stan. Stan was a nice guy, but really knew nothing about making a car go fast. He had several cars and after spending money managed to slow them all down.
So Stan calls me one day asking about what cam to run in a new project. I asked what he was running (motor, intake, carb/s, exhaust, trans, etc). And after he told me I said run a stock (or split profile) cam. Well he didn't like what I told him, so he called a friend who knows a TON about building motors, and asked the same question. What cam? So my friend asks him for the same info I did, then gave him the same answer.
Ultimately Stan didn't like either answer, cause it wasn't what he wanted to here (only what he NEEDED to hear) So he puts the big bumpy cam in this thing and guess what. Yeah, it won't run. So like with cars before this one, he gets frustrated and gets rid of the car.
Moral of the story..... don't ask questions you don't want an answer to
good luck with your project