390 cfm vs super six

Itll never gulp 390 CFM but that little carb is pretty versatile. You can alter the springs in the secondary well and have them open when they're needed, but I bet its not too often. a paper clip on the actuator rod is an indicator of how far they open.
"....Let assume that we are going to upgrade a 225 CID engine is going to run at a maximum of 5000 RPM. With 100% volumetric efficiency (VE), we will theoretically need 325 CFM but, since there are pressure drops in the induction system, we will only need 244 CFM with a VE of 75% and 276 CFM at 85%. .."
Carburetion