From my searching, the EK blocks are NOT compatible with EVGA ACX cards as they are not reference design. The only full block I've found is the following Alphacool one (it's available in either polished stainless or copper). Gonna get pricy in the long run, which is why I'm leaving my 760's under ACX and I'll liquid cool whatever I get next.
http://www.alphacool.com/product_info.php/info/p1273_Alphacool-NexXxoS-NVXP-Nvidia-GTX760---Polished-Stainless-Steel---Black.html