We built a 383 SBC for a friend and it used 7 quarts of oil in 400 miles. I looked at it and the custom valve covers he was using had the PCV directly over a rocker arm. The oil was squirting straight into the PCV valve. I machined a new PCV hole and the problem was fixed.
Take a look at the hose going from the PCV to the intake manifold.
Ron
