I have a chance to buy 4 1/2 cords of "Block" Hardwood. They are 4x4 and 4x6 blocks cut from heavy duty pallet ends. Anyone use such wood? I have a Hearthstone Mansfield and am concerned about overfiring due to the fact that the wood is dried hardwood. I imagine (since the wood is square blocks) that if I fill the stove correctly by stacking the wood instead of just tossing it in that it would burn at a good rate. Thoughts?