340 engine oil consumption ???

Thanks, changed the PCV valve, to no avail. I'll do some look'n 2 C if I have bunch of oil on engine. -- NOPE ! Now 4 a good crank case flush? Any one better than the next? Drove it 30 miles to show last week end and took 3/4 quart of oil at this rate I won't have to change the oil for years.
I really appreciate your help. Just wish my angel would be a bit more forcoming with the solutions. But then nothing is easy. .. dw