your gut would probly explode if your went from 2000 to 7000.......
easiest way to do it is to forgett about cals, and just add weight to each meal... eg
your 200g chicken, with 50g of rice would turn into 250g of chicken with 100g rice... just add a little bit at a time and guage on how you look ,weather to add or take away....
you dnt say how many meals you eat each day either, if your eating 6 meals you could squeeze in a 7th,
one things for sure, you dont want to get fat, but you dont wanna be too lean, or your holding back your gains.