The dilemma seems pretty straight forward.
You want to gain weight but not get fat.
While it's true that in order to gain you have to eat, it doesn't mean that your life just turned into a round the clock Mandarin buffet.
You have to use just as much common sense eating as all of those around you that are trying to lose weight in order to maintain a steady gain that is healthy and long lasting.
We all know that maintaining a constant body weight requires a certain amount of calories on a fairly consistent basis.
Alter that intake, either up or down, and the result will be fluctuation in your weight.
You want to gain weight, you have to eat more.
The big question is how much more? A natural trained person, doing everything exactly right can hope to gain ½ to 1 pound of muscle per week.
Add on your lack of genetic giftedness in the gaining department and any deficit in your meal planning and it decreases even more.
Adding an extra 2000 calories to your diet is not going to change those facts.
The more you consume the higher risk you take of putting on unwanted fat.
Aim for an additional 250-500 calories above your normal intake.
This should maximize your muscle building efforts.
Watch your body fat levels and trust the mirror to tell you if there is too much fat gain.
You will have to play with the numbers a little in the beginning to find what the best intake is for you.
Slow and steady wins the race.
Building muscle on top of fat isn't nearly as sexy as clean, chiseled definition and bulk.