Although the guidelines state that a level greater than 15 iu/dL should be sufficient for haemostasis it would probably be wise to cover the surgery with FVII concentrate given the previous bleeding history and likelihood of blood loss. 

Probably aim for levels between 40-50 iu/dL with FVII concentrate.

Monitor FVII levels and keep level above 30 iu/dL with further infusions for a minimum of 5 days post op.