Thats an nforce2 board your using?
Im not sure if it will be possible with the case your using, on mine Ive cut your parts of the mobo tray so that I can mount blocks more easly for cpu and nb. If your able to touch the back of the nb - very inaccurate i know, you could guess the temp.
Using a badly mounted atlantis nb block on my nf7-s it felt like 80 degrees with 220fsb (nf7-s r1.1). When mounted properly it was about the same as my water temp. Might be a good idea just to check its mounted properly, which can be difficult with nforce2 cores becuase they are far from flat, esp the original chipset with a metal insert.
I dont think a maze4 will have any trouble cooling a nb, doesnt output nearly as much heat as a cpu.
Nice block btw
