Overheating 360 new engine

Ok guys thanks again for the help. I have been tied up with hurricane mess. I am following this post. I worked on the car this evening. I called March tech line, and I inquired about the pump and direction of the pump. Everything there is fine. I did order a new set of fans and a fan shroud. I decided to do a leak down test on the engine. I did 4 cylinders tonight. 1,8,4,3. All 4 cylinders have about a 10% leak. Also, I stuck my stethoscope tube over the oil dipstick, and I hear air escaping to the crank case. I don't have much experience with a leak down tester. How much or if any air should escape into the crank case? The engine has less than 200 miles on it. I will post a picture of my spark plugs tomorrow. They are telling a story as well. On the four cylinders that I checked the valve lash is good.