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.
Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.