Well,
I have some bad news.
The block won't fit on my Gigbayte P35-DQ6 (rev. 1.0), as it is blocked by the mosfet cooler.
The mounting plate is about 3mm to long, and trying to mount it vertically is no option either, as the NB is to big and blocks the cooler too.
Bummer.

No I have to think what I'm gonna do.
Return the block to the store I bought and ask a refund, or choose another block.
Damn'.