Single vs Dual Plane, big difference?

Captainkirk said

Another vote for SMALL PORT dual-plane and a 600. The 750 is really gonna e too much carb; secondaries will never fully open. My vote would be Eddy Performer carb (AFB)...the 600 cfm version.
Will make plenty of grunt down low and still give you good R's up to about 5500.

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Considering carburetor technology has improved over the past say 20 years. With the right carb you can go bigger without the adverse side effects. You don't have one of those carburetors.

now on to your engine. I would say 600 is the minimum, with the right carb you could go to 750cfm. Many people would be happier with a smaller carb. On the flip side, I found myself happier with a larger carb as did my engine.

One thing after running MANY different carbs over the years is that the Holley based carbs in my opinion are the best to work with. I would never run another Edelbrock carb. Add to that list the Demon. They've been hit and miss. Another thing I'd stay away from is vacuum secondary carbs. Run a mechanical secondary carb, tuned properly they are the best.