What he said^^^PogKai said:ITR head is better cause it has slight P&P, better cams, better lost motion assemblies. But i'd rather have a B16 and do some work with it. And if you're looking for compression.. the GS-R head will do better at that task.
GSR has the higher compression and flows pretty much the same as B16.
But i think you should just get the head you get the best deal on give it a P&P and valve job and you have every thing else.
and yes ITR come stock with Dual valve springs