Before Markos starts jumping up and down about this (I believe he has said it about 1 million times just on the forums) you get big from providing a stimulus to your muscles and then eating a lot of food. So PPP provides a great stimulus and you can add as much assistance work as you want to it, if you feel the need, but then you still have to eat all the food in your fridge.
So you can do the set PPP for a 120kg max bench and add in dumbbell flyes as assistance if you feel your pecs need more stimulus, along with other quality exercises.