with a 2.080 valve a little more than 300 cfm is a good normal number...

ive done magnum heads that are for super stock, 180 cc int runner, 2.020 valve,,, flow 285-290,, on a .060 over 360, 12/1, fuel injected make 685hp,, guy just set the record in ss/ia this past weekend,, in a 3200lb car or so went 9.62 at about 85% throttle,, ran high 9.40's at 3300lbs at 100% throttle