The picture was taken at the 1983 Masters in Rough River, Kentucky. The pink airplane with the inverted engine is Don Weitz, it had a long stroke Webra with a S turn hearer and the pipe in the top of the fuselage. The other belonged Ron (Leslie Montague) Gilman. It appears to also have a long stroke Webra in it. They both worked for Circus Hobbies at the time.
Jim Kimbro