Has anyone ported stock magnum heads and have the before and after flow numbers .???

540 hp, so..IIRC the basic calculation would Be 270 CFM x2 = capability of 540 hp
I ported my engine quest heads on my Dakota r/t added a comp roller, good valve springs, ported the kegger intake, blended the throttle body and did a few other things.
The magnum really responded well to that stuff without tuning the factory computer.
What do you want to do with your car ?