Comp. Ratio?

Anyone have access to the specs to figure out what the comp ratio may be on my 360 with 318 heads?
Both the motor and the heads are stock.
I know I know I am sufficating the 360, but when it was built it was on a High School budget. I have to say that combo is Torque-y as hell! Thats actually why Im wondering about the ratio.


Side note: Have J heads, need a new intake. Then it'll be a whole top end swap for some more HP. I love the torque this setup has now though, itll really be fun with the new suregrip back there!