not sure on how much horse you will get but here's stock specs...
note that these motors have more diffrence than just compression ratio, but its just to show you the increases...
158@7600 112@7000 10.2:1
168@7800 116@7300 10.4:1
185@8200 118@7500 10.8:1
like i said, more diffrent than just compression increases, check the refrence section to see what these motors came out of...