Ok if you wanna go turbo...u can keep the head STOCK. Just build the bottom end. Theres so many routes you can take to make this happen. I'm an all motor guy and NO ITS NOT WASTE OF MONEY. If you want to rev up to 11k u need to build the bottom end, work on the crankshaft, balance and blue printed on that specific specs. The head is only to be build to handle high rpm but doesn't mean u can rev that high unless the bottom is built right. You can go on pump gas even if you bump the compression 12:0 but needs to be TUNED right and its kinda hard. I'd say stick with 11:5 and you'll be fine. No one here can give you exact numbers on what hp or torque cause it depends on the tuning and who tunes your car. Go to
www.importbuilders.com. These guys know what they're doin.