I will enclose a link to picture of a cutaway of one of these. It seems that water is pretty close to everything so any major porting would be limited (though I will still do the best I can. I have thought maybe setting the block up on a mill cutting the ports out and installing sleeves in the ports but I don't know if it will seal.
https://www.dropbox.com/s/ni9mb6iclwio86k/618_519043579c803.jpg
