I have never seen a 71cc chamber. They always spec out more. Typically around 76cc's. Your compression will be in the 7s with the 360 heads on the 318. Port the 318 heads instead and install 360 size valves.
So in your opinion milling the head to the max is not an option? I really do not plan on messing with the 318 heads as I want the car running and on the road as I play around with this side project.
