I dunno, Howard, at the time, a Flight Streak with a Fox Combat Special Series 3 on it running on cc pressure and Missel Mist sure did seem fast to me, but then, I never was in any contests and my 'combat' experience was limited to me and my flying buds playing around.
What engines were any faster at that time? I have both a Johnson CS as well as a Torpedo GH Combat and running on the bench, they don't seem to have anything on the Fox..