I took the liberty of going to an on-line Dcr calculator, and using the cam specs you supplied,and with a bore of 3.94, stroke of 3.31, a total chamber volume of 83cc, and an intake closing point of 70*ABDC, Your Dcr would be 6.65( with a generous static cr of 9.1)
Thats 6.65! The heads and the cam really need to go.
