I'm going to have to agree and disagree at the same time. LOL (Some good info, and some very misleading as well)
The Airflow Model of the calibration should be modified appropriately for changes that affect the VE of an engine. This has nothing to do with the Maff.
Maff = Reactive fueling
Airflow Model = Proactive fueling
Get the Airflow Model correct and the Maff is cake. Real flow data can be used assuming the intake 'system' has been designed correctly. (Read dcarlson's post above)
I think you mean "MAF"