I am big guy, 6'6" and my RDI for weight gain is 4k cals a day. This is proving quite difficult without carbs. I can down a bunch of fatty beef but this is putting my fat calorie percent at like 75%. Is there anyway to get to 4k without eating all day long or eating a disproportionate amount of fat?
I'm finding it a bit hard to make sense of your question. In the literal sense, the answer is no. Fat is the highest source of calories by weight. If you want the same amount of calories from protein or carbohydrate, you have to eat more than twice as much.
If you are not eating carbohydrates, and it isn't clear from your question why you are not, (though I certainly don't think they are needed), then you do want a good proportion of your calories to come from fat -- 75% is practically ideal, not "disproportionate" at all.
On the other hand, if you do decide to eat carbohydrates, then you will probably find it easier to consume more calories, even though they are less caloric, because they will stimulate your appetite, whereas restricting them will suppress it.
Five words: Gin with a marzipan chaser. Wait, hear me out:
Shockingly, fossil records from Namibia show that this was the staple diet of late paleolithic groups there--shocking because almonds aren't even thought to have existed at the time, let alone Italians.
It should be no surprise that distant ancestors of ours subsisted primarily on this diet, though, since a baseball-sized serving of marzipan soaked in gin provides a whopping 9,500 calories of sustenance. Sure, there's a fair amount of o-6 fat in there, but it's all offset by the drunkenness.