Sounds like it could be bad machine work. I had a 283 years ago that did the same thing. I had it bored .030 and new everything, it still used the oil. I've learned and believe in using "Torque Plates' on the block for boring and honing. They simulate the torque of the head and then you bore the cylinder. This gives a true round cylinder after the head is torqued down,thus giving a better ring seal. Or it could be the intake or valve guides,or a combo of any of these things.My .02 Good Luck!
