Richie Eurich - Question re big Nazareth track  

Couldn't let this go, and may have an answer! Richie Eurich finished 3rd in two of the 25-lap features held 9-4-83 on the dirt mile. He finished 13th on 4-28-91 in his #10 on the asphalt mile. Now it gets interesting: he was the 1971 modified champion at the Nazareth half mile. And 1971 was the last year of racing on the 1 and 1/8 mile dirt. I'm thinking it's totally possible that he raced the big track during at least one of the five races held that year. Can anyone confirm his competing at the big track in 1971?