2g protein per lb desired bodyweight, for you I'd say 400g to get you up to the 200lb mark. Make sure this gets eaten, over half of it is from whole food (not shakes) and at least 300g is from complete protein sources e.g. meat (preferably red meat), eggs, dairy, whey.
After protein, eat low gi carbs until your belly is physically full to the brim. Really, you have to eat until you feel pregnant and/or physically sick, don't worry you'll get used to this.
If you're not gaining weight then add fat sources to protein shakes to boost calories (from EFAs or monos/polys e.g. flax oil, olive oil). Start with one tablespoon of oil in every drink and work your way up as you need. Of course you could use nuts, peanut butter etc for this but oil is the most convenient and easiest to down without filling you up.
Drink 2 gallons of water daily to help your body process all the protein.
Junk food once in a while won't hurt.
I don't know about your bodyfat, but expect to lose your abs for a while, the increased protein intake will bloat you out something terrible, but take a couple of weeks off with light workouts and less meals and see the sixpack come right back .. (or whatever, what I'm basically saying is don't panic if you think you're getting fat, chances are you're not.. just stick to a sensible carb cutoff and don't mix food categories overmuch, do some light a.m. cardio to help control bodyfat as well but if you have a really fast metabolism probably you don't need this).
Want a sample diet? Here's what I'm having today.
Meal 1 - 250g lean beef in 3 pitta breads
Meal 2 - 250g lean beef, oats until I was full (pre workout)
postworkout: 80g protein shake with 100g carbs
Meal 3 - 250g chicken breast, oats until I was full
Meal 4 - 60g protein shake with a couple of carb counter nut bars
Meal 5 - 8oz sirloin, half a rack of ribs, 2 greek salads
Meal 6 - 250g chicken breast, green beans until I was full
Probably about 500g protein in there. Yum yum.