I need to change the head gasket and water pump what would it cost

This cannot be quoted accurately as there may be head damage to repair, your local mechanic may be able to quote the job using a reco change over head, but local prices may vary as may labor rates, so make a few phone calls and see if they will quote this using a change over head, there should not be any other surprises apart from may be hoses and the radiator to be checked as well.