It'll fit easily, you just have rotate the shroud 90 degrees. Use two fans, it made a 5C difference for me. The fan on the shroud MUST suck. The other fan should be rotated 45 degrees and blow, sucking air from the DIMMs direction. I used nylon ties to attach it.
Also, the PEP66 doesn't like overpressure, it'll make the temps go skyhigh. I tried that and my temps went so high that the machine rebooted. Checked the temps after that in the bios and they were 66C.