Bear ===
There is MATH for that:
Take your CUBIC INCHES X's MAX RPM divide by 3456 X's the V/E of .85
So in your case
468 X's 6000 = 2,808,000
2,808,000 div by 3456 = 812.5
812.5 X's .85 = 690 CFM
That is making some assumptions - such as max rpm - and using a relatively conservative assumption of engine volumetric efficiency (85%)
I'd probably be running an 850 CFM and mess with the jetting til it was right.
Math works out to an 800 CFM if you raise the RPMS to 6500 and use .90 for VE....
Too big is worse than slightly small IMHO. Higher airflow will help your idle - and throttle response and you won't notice the 10 HP at the top end you might lose. My bet is that with the right carb - your torque would jump up and your car will be and feel far faster.
