Slant 6 4bbl Carb Selection

Hey guys. I want to do a performance slant six build, and I originally wanted to do a triple Weber setup. Since I don’t have the cash and Redline hasn’t been able to resume manufacture of the manifold, I’ve decided to cut my losses and just go for the cheaper 4bbl route. I’ve found a manifold that’s in stock, but I want some recommendations for what carb to put on it. I’ve bought a bigger cam, and I’m planning a set of 3-2-1 headers for the exhaust. How many cfm can I make use of? I don’t wanna blast all my cash away on a bigger carb than I can actually use, but I also don’t wanna miss out on any gains by going smaller than I can. What do you guys think?

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Depends if you are a Holley or Edelbrock guy.
Holley guy ? Holley 390 Edelbrock guy ? Edelbrock 500

On another note: Talking about funds and doing stuff cheaper. I would steer you in the direction of a Clifford or Ofenhauser intake, and Clifford headers. This will be less expensive, and give you as good or better performance. .02