With this setup, if you want the most bang for your buck use an A6 bottom end (removing the oil jet!), and a Y8 head.
This combo will give you a higher compression ( 10.8-10.9:1 ) and more
hp.
As for numbers, the avarage person will see 115-120 WHP, with some minor tuning you can easily get 125-130 WHP, and with a cam and cam gear 135-145 WHP is possible.