Not really sure what you are wanting to hear.
Primal friendly carbs will help you get those calories up if you are not wanting to lose weight, or crap loads of heavy cream and butter and bacon with everything, having eggs - bacon goes with that, it's nice with butter, Steak - bacon goes with that, oh and add some butter , brocoli and cheese sauce, bacon goes with that, loads of cream in the cheese sauce, almound flour muffins - bacon goes with that, don't forget the butter on the muffins, you get the idea
Almound flour backing food also really packs in the calories, as do nuts.
If you don't want to lose muscle eat some carbs as you are very active and plenty of protien.
You know all those pictures of Adam and Eve where they have belly button? Think about it..................... take as long as you need........................