The calories isn't the problem. There are a number of YouTuber Vegan athletes who will eat 2500 - 3000 calories a day. Freelee the Banana Girl ate that many calories. That is the only one I can think of off hand but I'm not sure she would make a good role model. I bet there will be other replies to your question with better recommendations about sites or videos to check out. "What I Eat In A Day" videos are very popular with this crowd. But getting a lot of calories isn't going to be a problem.
I'm not sure where you got the idea that you needed 270 grams of protein-a-day. But I'm sure it's wrong.
At my gym, the big bodybuilders talk about a coefficient. A number that you multiply against your weight (in pounds) to figure out how much grams of protein a day. Typically this is a number between 1 and 2. I'm wondering if that is how you got 270. Anyway the coefficient you
Should be using is between .37 and .48. Athletes might stay in the range of .6 to .9.
It's a very common mistake for people to overestimate their protein requirements. I'm pretty sure that a lot of this is perpetuated by the supplement industry. The nice thing for athletes is that hitting a protein number is easier for athletes because they are eating a lot of calories.
Maybe a better way to calculate protein needs is with percentages. This takes a lot more number crunching than the coefficient but I think is a much better way to do the calculation. The tricky part is that the percentages are the number of calories. not grams. Since protein and carbs have 4 calories per gram but fat has 9, this involves a bit more math.
the percentages are somewhat debatable. These are Protein - Fat - Carb percentages. 20-20- 60 is probably the most common ratio. Dr Barry Sears of The Zone used 30 - 30 - 40 when working with the champion Stanford swim team. Raw vegans use 10 -10 - 80.
Using 20% and your goal of 2800 calories, your protein target would be 140.
Further reading
How much protein should you eat? Is it safe? What's the best source? Get the answers to your burning questions right here!
www.bodybuilding.com
How Many Grams of Protein Per Kilogram of Body Weight?. Protein is needed for nearly every function in the human body, and is essential for building and maintaining muscle mass. High-protein foods include meat, poultry, seafood, soy products, seitan, eggs, dairy foods, legumes, seeds and nuts...
healthyeating.sfgate.com