Do you change any components when going from e6600 to an i7?

Distilled water and an approved biocide. Meaning Petras PHN Nuke or a IanH killcoil. There is nothing better, less troublesome than that. Unless you work at NASA and can get some Unobtainium fluid.

A LGA 1366 board has diff CPU cooling mounting hole spacing. So you'll need another top for that block or a fully new block. HeatKiller 3.0, Swiftech GTZ, Umm those are the best now.

The rest of your stuff is fine for WC a basic i7 920. If your a BIGGGG overclocker, your rad could be possibly a bit weak in size for best temps, but prolly just okay. Give it a try with what you have once you work out the CPU block issue.

Replacement screws for what part? Where the actual HS bolts on to the GPU chip? You have the air HS parts, all you need to do is ask around or find someone with a TINY set of taps to figure out the size. If you have 2 screws and are missing the other two, go to a watch shop and ask them. Once you know the size, there are billions of places on the web to buy the exact screws you need.

I know watercooling, I can't help you with your screw hole size. Maybe tech support to the manu of the board?

Look at motherboards. I mean really look. Some Core i7 motherboards have two sets of cooler mounting holes. The inner set is for mounting LGA-775 coolers.

Thanks for the info. Im going to try and find a picture of the ASUS Rampage II Extreme to see if i can see the holes.

True that. IIRC there is a Foxconn and MSI board that has LGA775+1366 holes. However, the board OP listed (ASUS Rampage) doesn't have LGA775 holes.

As far as screws goes, take a stroll at Home Depot/Ace,etc you may find them there if lucky.

The Rampage II Gene and P6T have them however.