Burning oil: At first having to add 1 quart every 200 miles. After 600 miles like this, having to hadd 1 quart at 100 miles. This is when I was able to park the car for repairs. No oil leaks

The valve guide didn't seem loose. I was able to get ahold of it and it didn't move at all.

My concern is what would cause the scorching on the porceline of the spark plug? The discoloration on the lable and the porceline is not oil.