My oil burning pig. Pics too!

yellow rose said
More than likely there are cracks from porting. Have the heads pressure tested and see what you get.

Also, find a shop that uses a vacuum source to put a vaccuum on the intake ports. If it doesn't pull the full gauge you can bet it is cracked

This is more than likely your problem according to mike at mrl eddy heads that are CNC ported can get really thin in places and can suck oil or hairline crack and suck oil . I'm going through the same thing as you at the moment .