Using a PCV Valve from valley pan in rear of motor to back of intake manifold on a Offenhauser  3/2 Aluminum manifold. Do you use a breather cap on the oil fill into the valley pan or do you use a non-vented oil cap? Also is it better to attach the PCV valve hose in the middle of the manifold between 1 and 2 carburetors of the three or in the middle of the back of the intake manifold? I am running progressive linkage on the three carbs. 0-70 on the middle carb, after 70 the other 2 pull in.  Motor has small performance  cam, aluminum Mummert Heads. 9.7 compression ratio and 40 over pistons.