Only one pitcher in major league history has ever accumulated more than 300 innings pitched, at least 9 K/9, and at least 6 BB/9.
Do NOT Google this, go look it up on B-R, etc., and then post the answer.
I will provide the answer after the morning links post tomorrow.
ANSWER -- The correct answer to the question is Mark Clear, a reliever with the Angels, Brewers and Red Sox in the 80s known for his big curve ball.
You can see his full stats here.