I have been wanting to get a custom loop for some time now and would like to get one very soon. I am new to custom loops and OCing. I want to cool my EVGA GeForce GTX 1070 FTW, and my i7-7700k. Are there any good websites I can go to for buying parts and how do I confirm if a block fits my GPU? The other question I have is, as a first time OCer, how much should I overclock my CPU?