Oil use issue------

I have the 67 notch on the road and have been tweaking the entire car as I put a few miles on it. I noticed abnormally high oil consumption and today I changed the oil & plugs & noticed the exhaust spitting raw oil out the tailpipe. I unhooked the PCV valve and the raw oil spitting stopped. Note, the pcv valve is new as well as the fresh carb kit. The engine is a 273 2V w/904. What the heck would cause this???? Any insight appreciated.
TIA-Rat