How much would it cost to get a head shaved or replaced on 2002 Chevrolet Camaro

Car overheated, got low on water - when I filled it back up it was surging back up out of radiator - so I know it has a blown gasket - so I need a rough estimate of how much I'm looking at to replace or fix the head if needed ? Thank's for advise

Asked by for the 2002 Chevrolet Camaro
6 or 8 cylinder? Blow water out after engine cold?