There were back-to-back Pontiac Indy Stock winners, in '73 & '74. Truman Fields in '73 & Al Vanis in '74
http://www.nhra.net/50th/results.asp?mYear=1973
http://www.nhra.net/50th/results.asp?mYear=1974
In '75, Mick Leiferman scored his 1st of 3 in-a-row RU's @ Indy, in his '71 GTO. These results show that Jack Mullins won 3 nats & was RU at another. I knew about the Indy & Sports Nats wins, not the other. Can't verify all these results.
http://www.nhra.net/50th/results.asp?mYear=1975
Pontiacs got on the board again in '76. Jack Mullins got a win & 2 RU's, in his big wagon. Charlene Wood went across the border to win the Grandnationals, in the Tons-a-Fun '72 Lemans wagon. Mick Leiferman got 2 RU's, and Rock Running got 1 RU, in his '71 T-37.
http://www.nhra.net/50th/results.asp?mYear=1976
Only '78 score I can see is another RU for Rock Running, @ the World Finals.
http://www.nhra.net/50th/results.asp?mYear=1978
Sonny Ray won the Cajun Nats in '79, in his SS '72 GTO.
http://www.nhra.net/50th/results.asp?mYear=1979