u do not need to tap the new head for the oil feed. Just buy yourself a SS Braided feedline and tap it off the oil filter housing. It'll make it easier on u by not having to tap the head, plus your turbo will be receiving freshly filtered oil from there, where as normally you'd be getting it from the head which is basically the end of the oil path so its not as filtered as it would be if u got it from the oil filter housing. Just look at the link, the picture explains it better than i can. and yes that head will work, just gotta put in turbo cams. and sorry i have no clue about the CAS.
http://www.roadraceengineering.com/instruc...lineinstall.htm