Hey, and take my advice with a grain of salt since I'm a neophyte and diet has always been one of my weak areas --
Your bod can only use so much protein. On the bright side, it's probably hard for most people to eat more than their body can metabolize and any extra is just converted and stored or pissed off.
If you're doing a high protein diet, that's cool - be sure to drink tons of water. Water doesn't get nearly enough press but for many it's considered the best suppliment out there.
Back to Protein, I think most people consider getting 1.4-1.6 grams of it per pound of lean bodyweight enough to pack on the muscle mass. If you're trying to bulk, don't skimp on the carbs or fats either.
Good luck, bro!