How can i gain weight? i want to be world's youngest and heaviest athlete?

I want to make it to guiness book of world reecord as world's youngest and heaviest athlete. I think the heaviest athlete of all time record is currently by Andre the Giant in the WWE at over 530 pounds. I'm currently 5'4 and i'm 336 pounds and i'm 19 years old. I want to get to at least 500 pounds and then a little more. I'm also a sumo wrestler in my school to help me keep in shape (kinda) I need to gain around 170 pounds within the next 2 months, what kind of foods should i be eating to do so?