Is that the dual or tripleslot shroud?
One idea you may want to consider is this,Mad DCII Mod
I used EK VGA Hf supreme copper blocks, I avoid EK Nickel due to the plating issues they had
the 750L pump will support two blocks yes, but the Rs 240 is a little weak for your plans, I'd add another rad to cover the Tdp of the Cpu and card, and if you're overclocking I'd suggest a 360 as well as the one you already have
@Jack, that list the 680 cover, are you sure that will fit the 670 as well? Pcb revisions etc may differ