Everything is good or ok in moderation, too much of ANYTHING will kill you. The thing about those burgers is that it will make your body work so hard to break down that fat (specifically your liver) Your liver makes the enzyme that breaks fats down. Although some fat is good for you, this much 96 g times 2= 192 grams! This means OVER half your calorie intake is from fat (per gram : carbs:4 calories, protein:4 cal, alcohol:7 cal, and fat :9 cal!) You will mess your liver up pretty dang bad, and you will quickly develope problems similar to an alcoholic. If you see super size me( which I have not yet) They probably explain a lot of it in there. I know I love the Good Times Guacamole bacon burger, but due to health reasons and the thing costs 3 bucks, I only get them 1-2 times a week.
Some things that are high in carbs you want are:
Fruit, Veggies, Bread, and Noodles. (yeah, you have heard this probably plenty)
Then for protein:
Chicken(Tyson has some good chicken strips), and pretty much all other meats.
Peanut butter is full of protein too. Either kind ( Natural or jiffy ). Natural is pretty good tasting, I make peanut butter sandwhiches with some milk to drink(another good protein source).
Remember to gain weight you don't eat like crap. Eat a lot, in moderation, and at least somewhat healthy. Eventually you will gain weight.
Next: when eating a lot, remember if you take what it takes to keep your weight stable(your old diet), add 500 calories a day and thats an extra pound a week (3500 cals.) 3000 is a rule of thumb because the "normal" person eats 2500, but if your metabolism is fast, you need more than 3000. I put down 3500 to 4000 per day.
More on fat:
Saturated fat: all carbons are saturated with hydrogen atoms (Not GOOD)
Unsaturated fat: At least one set of carbons share more than one electron making it impossible to be fully saturated. Less saturation
Polyunsaturated fat: more than set of carbons share more than one electron... same as above, more electrons shared.
Trans FAT: Don't eat this crap, it is worse for you than anything. It is a type of fat made so the carbons are super saturated and your body has no idea what it is (I consider it "super saturated fat"). It is found in crap like twinkies. Food and Drug admin is soon making it required that all things with trans fat in it is labeled.