1994 Chevy Camaro crankcase ventilation

Engine Mechanical problem
1994 Chevy Camaro 6 cyl Two Wheel Drive Automatic 197xxx miles

The intake on my sons 1994 Camaro 3.4 V-6 keeps filling with oil. I replaced the pcv valve, but the breather tube leading into the intake is blowing white smoke and oil. What could be the cause? The car has no low end power. We have replaced: fuel filter, air filter, 2 oxygen sensors, map sensor, spark plugs, plug wires, fixed numerous vacuum leaks, the pcv valve, and the oil. All fluids are full. Could the oil being blown into the intake cause this problem? If so, what's the remedy? Thanks