While I have 440source heads and really like them, it still irks me that they over-inflate the flow numbers on their website.

"Intakes flow about 280-290 CFM as cast, with the potential to reach at least 330 CFM or more with porting."

'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.