A 600 CFM is ideal for the small block, You can as described above, tune it up or down, The Edelbrock, or Carter is far better suited for the street then the Holley, There are rods that can be changed in about 5 minutes each, that will "tune" the fuel flow into the jets. Once you look at the rods you can get a pretty good understanding how they work. These rods can be replaced with taking nothing more off then the air cleaner and a very small plate like cover on the top of the carb. if you are running a little rich, put a rod in that is a little bigger then the one in now, ( resricting fuel flow a touch) If you need more flow, then put one in that is smaller then the one you take out.(allowing more fuel to flow) Remember, you have to change two rods. One on each side of the air throat inlet. The rods are tapered, And they have different tapers, so you can adjust the flow throughout the RPM, range. MUCH more user friendly then the holley configuration for tuning..
Ron
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