The old rule of thumb for wood was 1 full cord for each 25 gal of syrup minimum. The wood should be split wrist size and well dried. With 400 taps on vacuum you could make 200 gal in a good year, or more. I suggest either 10 cords or have a buyer lined up to buy your excess during times of heavy sap flow.
2x6 evaporators can boil from 25-70 gal/hr, depending on several factors.