I’m not a big believer of counting just the number of calories when it comes to either losing/gaining weight or even with bone healing, you should always look at the macro and micro nutrients of the food you’re taking, you should take note that Carbohydrates and Proteins has 4 calories per gram while Lipids or Fats has 9 calories per gram, You should also monitor the quality of carbs,proteins and fats that you’re taking because not all of them are made equal, sure you can attain that 8,000 calories but if they are mostly compose of Saturated and Trans Fat together with bad carbs then it won’t help you, you should also watch for bad stuff such as sodium, glucose etc. that’s bad for bone healing because they inhibit calcium absorption, reduce bone mineral density etc., honestly I suggest don’t count the calories that you’re taking instead try to reach the macro and micro nutrients that you need each day together with your supplements I think you’ll be fine, a lot of good doctors and nutritionist will agree with me on this, but then again that’s just me and you can always do your own research, Goodluck and safe LL journey!