Jim, Pancho Carter is correct. Even though he is not listed in the UMRA All Time Feature winners list he is in the 1970 UMRA Yearbook.
FEATURE RACE WINNERS
July 24th.....Salem, Ind......D. Carter, Jr.
FAST TIME
July 21st.....Madison, Ind......D. Carter, Jr.
TRACK RECORDS
Madison, Ind......D. Carter, Jr. #3.....11.97 seconds.....1970
He's still listed as the track record holder in the UMRA yearbooks (Duane Carter, Jr.) up until the 1977 book which lists him as the track record holder on the old track at 11.970 seconds and Ronnie Ambrose as the track record holder on the new track at 17.099 seconds.
AJ you're right, Hunsaker didn't win a feature. Also Dana Carter is correct as a UMRA winner (7/22/72 at Rushville) but not a USAC champion. He also had fast time and won the feature on 7/19/72 at Salem.